| 1 | # From laura_fairhead@talk21.com Fri May 10 11:24:41 2002
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| 25 | # for <bug-gawk@gnu.org>; Thu, 09 May 2002 22:39:56 -0400
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| 32 | # X-Mailer: talk21 v1.24 - http://talk21.btopenworld.com
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| 33 | # From: laura_fairhead@talk21.com
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| 34 | # To: bug-gawk@gnu.org
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| 35 | # X-Talk21Ref: none
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| 36 | # Date: Fri, 10 May 2002 03:38:42 GMT+01:00
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| 37 | # Subject: bug in gawk 3.1.0 regex code
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| 38 | # Mime-Version: 1.0
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| 39 | # Content-type: multipart/mixed; boundary="--GgOuLpDpIyE--1020998322088--"
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| 40 | # Message-Id: <20020510023921.EEW24107.wmpmta04-app.mail-store.com@wmpmtavirtual>
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| 41 | # X-SpamBouncer: 1.4 (10/07/01)
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| 42 | # X-SBClass: OK
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| 43 | # Status: RO
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| 44 | #
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| 45 | # Multipart Message Boundary - attachment/bodypart follows:
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| 46 | #
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| 47 | #
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| 48 | # ----GgOuLpDpIyE--1020998322088--
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| 49 | # Content-Type: text/plain
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| 50 | # Content-Transfer-Encoding: 7bit
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| 51 | #
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| 52 | #
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| 53 | # I believe I've just found a bug in gawk3.1.0 implementation of
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| 54 | # extended regular expressions. It seems to be down to the alternation
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| 55 | # operator; when using an end anchor '$' as a subexpression in an
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| 56 | # alternation and the entire matched RE is a nul-string it fails
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| 57 | # to match the end of string, for example;
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| 58 | #
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| 59 | # gsub(/$|2/,"x")
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| 60 | # print
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| 61 | #
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| 62 | # input = 12345
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| 63 | # expected output = 1x345x
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| 64 | # actual output = 1x345
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| 65 | #
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| 66 | # The start anchor '^' always works as expected;
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| 67 | #
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| 68 | # gsub(/^|2/,"x")
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| 69 | # print
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| 70 | #
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| 71 | # input = 12345
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| 72 | # expected output = x1x345
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| 73 | # actual output = x1x345
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| 74 | #
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| 75 | # This was with POSIX compliance enabled althought that doesn't
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| 76 | # effect the result.
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| 77 | #
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| 78 | # I checked on gawk3.0.6 and got exactly the same results however
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| 79 | # gawk2.15.6 gives the expected results.
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| 80 | #
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| 81 | # All the follow platforms produced the same results;
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| 82 | #
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| 83 | # gawk3.0.6 / Win98 / i386
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| 84 | # gawk3.1.0 / Win98 / i386
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| 85 | # gawk3.0.5 / Linux2.2.16 / i386
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| 86 | #
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| 87 | # Complete test results were as follows;
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| 88 | #
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| 89 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 90 | # regex input expected actual bug?
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| 91 | # -------------------------------------------------------------
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| 92 | # (^) 12345 x12345 x12345
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| 93 | # ($) 12345 12345x 12345x
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| 94 | # (^)|($) 12345 x12345x x12345x
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| 95 | # ($)|(^) 12345 x12345x x12345x
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| 96 | # 2 12345 1x345 1x345
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| 97 | # (^)|2 12345 x1x345 x1x345
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| 98 | # 2|(^) 12345 x1x345 x1x345
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| 99 | # ($)|2 12345 1x345x 1x345 **BUG**
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| 100 | # 2|($) 12345 1x345x 1x345 **BUG**
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| 101 | # (2)|(^) 12345 x1x345 x1x345
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| 102 | # (^)|(2) 12345 x1x345 x1x345
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| 103 | # (2)|($) 12345 1x345x 1x345 **BUG**
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| 104 | # ($)|(2) 12345 1x345x 1x345 **BUG**
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| 105 | # ((2)|(^)). 12345 xx45 xx45
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| 106 | # ((^)|(2)). 12345 xx45 xx45
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| 107 | # .((2)|($)) 12345 x34x x34x
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| 108 | # .(($)|(2)) 12345 x34x x34x
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| 109 | # (^)|6 12345 x12345 x12345
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| 110 | # 6|(^) 12345 x12345 x12345
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| 111 | # ($)|6 12345 12345x 12345x
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| 112 | # 6|($) 12345 12345x 12345x
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| 113 | # 2|6|(^) 12345 x1x345 x1x345
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| 114 | # 2|(^)|6 12345 x1x345 x1x345
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| 115 | # 6|2|(^) 12345 x1x345 x1x345
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| 116 | # 6|(^)|2 12345 x1x345 x1x345
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| 117 | # (^)|6|2 12345 x1x345 x1x345
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| 118 | # (^)|2|6 12345 x1x345 x1x345
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| 119 | # 2|6|($) 12345 1x345x 1x345 **BUG**
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| 120 | # 2|($)|6 12345 1x345x 1x345 **BUG**
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| 121 | # 6|2|($) 12345 1x345x 1x345 **BUG**
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| 122 | # 6|($)|2 12345 1x345x 1x345 **BUG**
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| 123 | # ($)|6|2 12345 1x345x 1x345 **BUG**
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| 124 | # ($)|2|6 12345 1x345x 1x345 **BUG**
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| 125 | # 2|4|(^) 12345 x1x3x5 x1x3x5
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| 126 | # 2|(^)|4 12345 x1x3x5 x1x3x5
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| 127 | # 4|2|(^) 12345 x1x3x5 x1x3x5
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| 128 | # 4|(^)|2 12345 x1x3x5 x1x3x5
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| 129 | # (^)|4|2 12345 x1x3x5 x1x3x5
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| 130 | # (^)|2|4 12345 x1x3x5 x1x3x5
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| 131 | # 2|4|($) 12345 1x3x5x 1x3x5 **BUG**
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| 132 | # 2|($)|4 12345 1x3x5x 1x3x5 **BUG**
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| 133 | # 4|2|($) 12345 1x3x5x 1x3x5 **BUG**
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| 134 | # 4|($)|2 12345 1x3x5x 1x3x5 **BUG**
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| 135 | # ($)|4|2 12345 1x3x5x 1x3x5 **BUG**
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| 136 | # ($)|2|4 12345 1x3x5x 1x3x5 **BUG**
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| 137 | # x{0}((2)|(^)) 12345 x1x345 x1x345
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| 138 | # x{0}((^)|(2)) 12345 x1x345 x1x345
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| 139 | # x{0}((2)|($)) 12345 1x345x 1x345 **BUG**
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| 140 | # x{0}(($)|(2)) 12345 1x345x 1x345 **BUG**
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| 141 | # x*((2)|(^)) 12345 x1x345 x1x345
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| 142 | # x*((^)|(2)) 12345 x1x345 x1x345
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| 143 | # x*((2)|($)) 12345 1x345x 1x345 **BUG**
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| 144 | # x*(($)|(2)) 12345 1x345x 1x345 **BUG**
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| 145 | # x{0}^ 12345 x12345 x12345
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| 146 | # x{0}$ 12345 12345x 12345x
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| 147 | # (x{0}^)|2 12345 x1x345 x1x345
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| 148 | # (x{0}$)|2 12345 1x345x 1x345 **BUG**
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| 149 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 150 | #
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| 151 | #
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| 152 | # Here's the test program I used, a few of the cases use ERE {n[,[m]]}
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| 153 | # operators so need '-W posix', (although the same results minus
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| 154 | # those tests came out without POSIX compliance enabled)
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| 155 | #
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| 156 | # [ Invocation was 'gawk -W posix -f tregex.awk' ]
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| 157 | #
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| 158 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 159 | # tregex.awk
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| 160 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 161 | BEGIN{
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| 162 | print _=sprintf("%-20s%-10s%-10s%-10s%-10s\n","regex","input","expected","actual","bug?")
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| 163 | OFS="-"
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| 164 | $(length(_)+1)=""
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| 165 | print $0
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| 166 |
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| 167 | while(getline <ARGV[1]) # ADR: was testre.dat
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| 168 | {
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| 169 | RE=$1;IN=$2;OUT=$3
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| 170 | $0=IN
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| 171 | gsub(RE,"x")
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| 172 | printf "%-20s%-10s%-10s%-10s%-10s\n",RE,IN,OUT,$0,$0==OUT?"":"**BUG**"
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| 173 | }
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| 174 | }
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| 175 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 176 | #
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| 177 | # This is the test data file used;
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| 178 | #
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| 179 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 180 | # testre.dat
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| 181 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 182 | # (^) 12345 x12345
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| 183 | # ($) 12345 12345x
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| 184 | # (^)|($) 12345 x12345x
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| 185 | # ($)|(^) 12345 x12345x
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| 186 | # 2 12345 1x345
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| 187 | # (^)|2 12345 x1x345
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| 188 | # 2|(^) 12345 x1x345
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| 189 | # ($)|2 12345 1x345x
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| 190 | # 2|($) 12345 1x345x
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| 191 | # (2)|(^) 12345 x1x345
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| 192 | # (^)|(2) 12345 x1x345
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| 193 | # (2)|($) 12345 1x345x
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| 194 | # ($)|(2) 12345 1x345x
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| 195 | # ((2)|(^)). 12345 xx45
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| 196 | # ((^)|(2)). 12345 xx45
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| 197 | # .((2)|($)) 12345 x34x
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| 198 | # .(($)|(2)) 12345 x34x
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| 199 | # (^)|6 12345 x12345
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| 200 | # 6|(^) 12345 x12345
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| 201 | # ($)|6 12345 12345x
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| 202 | # 6|($) 12345 12345x
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| 203 | # 2|6|(^) 12345 x1x345
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| 204 | # 2|(^)|6 12345 x1x345
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| 205 | # 6|2|(^) 12345 x1x345
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| 206 | # 6|(^)|2 12345 x1x345
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| 207 | # (^)|6|2 12345 x1x345
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| 208 | # (^)|2|6 12345 x1x345
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| 209 | # 2|6|($) 12345 1x345x
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| 210 | # 2|($)|6 12345 1x345x
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| 211 | # 6|2|($) 12345 1x345x
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| 212 | # 6|($)|2 12345 1x345x
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| 213 | # ($)|6|2 12345 1x345x
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| 214 | # ($)|2|6 12345 1x345x
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| 215 | # 2|4|(^) 12345 x1x3x5
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| 216 | # 2|(^)|4 12345 x1x3x5
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| 217 | # 4|2|(^) 12345 x1x3x5
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| 218 | # 4|(^)|2 12345 x1x3x5
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| 219 | # (^)|4|2 12345 x1x3x5
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| 220 | # (^)|2|4 12345 x1x3x5
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| 221 | # 2|4|($) 12345 1x3x5x
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| 222 | # 2|($)|4 12345 1x3x5x
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| 223 | # 4|2|($) 12345 1x3x5x
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| 224 | # 4|($)|2 12345 1x3x5x
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| 225 | # ($)|4|2 12345 1x3x5x
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| 226 | # ($)|2|4 12345 1x3x5x
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| 227 | # x{0}((2)|(^)) 12345 x1x345
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| 228 | # x{0}((^)|(2)) 12345 x1x345
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| 229 | # x{0}((2)|($)) 12345 1x345x
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| 230 | # x{0}(($)|(2)) 12345 1x345x
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| 231 | # x*((2)|(^)) 12345 x1x345
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| 232 | # x*((^)|(2)) 12345 x1x345
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| 233 | # x*((2)|($)) 12345 1x345x
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| 234 | # x*(($)|(2)) 12345 1x345x
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| 235 | # x{0}^ 12345 x12345
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| 236 | # x{0}$ 12345 12345x
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| 237 | # (x{0}^)|2 12345 x1x345
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| 238 | # (x{0}$)|2 12345 1x345x
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| 239 | # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 240 | #
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| 241 | # I've attached a full copy of this e-mail in ZIP format
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| 242 | # in case of e-mail transport errors corrupting the data.
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| 243 | #
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| 244 | # I've posted the same bug report to gnu.utils.bug and
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| 245 | # it's being discussed in this thread on comp.lang.awk;
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| 246 | #
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| 247 | # From: laura@madonnaweb.com (laura fairhead)
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| 248 | # Newsgroups: comp.lang.awk
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| 249 | # Subject: bug in gawk3.1.0 regex code
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| 250 | # Date: Wed, 08 May 2002 23:31:40 GMT
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| 251 | # Message-ID: <3cd9b0f7.29675926@NEWS.CIS.DFN.DE>
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| 252 | #
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| 253 | #
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| 254 | # byefrom
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| 255 | #
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| 256 | # Laura Fairhead
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| 257 | #
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| 258 | #
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| 259 | #
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| 260 | #
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| 261 | # --------------------
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| 262 | # talk21 your FREE portable and private address on the net at http://www.talk21.com
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| 263 | # ----GgOuLpDpIyE--1020998322088--
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| 264 | # Content-Type: : application/zip;; Name="COPY.ZIP"
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| 265 | # Content-Transfer-Encoding: base64
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| 266 | # Content-Disposition: attachment; filename="COPY.ZIP"
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| 267 | #
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| 268 | # UEsDBBQAAAAIALoaqiyj8d/bjwMAAKsaAAADAAAARklMrVjfa+JAEH4P5H8ISwrRU9EYfbheKBR6
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| 269 | # xRcLvevbYbFtzsqJlBrpQr3722+zMWZ31pk1MaG0Q/m+nR87O9kvruM6/5p4XOc9WSTc05/l
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| 270 | # +m2bSivhb8lzmrx43vw53c5X2f+etourHOc63XMe1wlmLQ8+g3AYjaTFD2ZplY9g+xRbWly3
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| 271 | # NPastYMrQN9cs4DvHYz+dHbomY8SOTctGDlcQfXND1Uz6cK3EXcVdpY37ltSuB55u339cNtu
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| 272 | # F76NPTudHYR0zS2RZ/sd1maHVLdYI/cp31b2PvFW72jkvIi2tLTI94nXY/eCfeZK8Ap7GO1b
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| 273 | # u7QAO8+8FjsLfFx7OowtfW6dLYRv22wZ031uYYc7M/aK5xvEfjp7vDPnQxW2OZuqndDxWeyw
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| 274 | # dt6y5rXPt5xrqG8bW9a8tm8ZN1q1UyYTXvNT2HjN7VWLLL3GR7pl9nlUkx1Z+5xm2/qcYsu4
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| 275 | # z2KHtfOWNad6jR92jGN9jvm2sSNbn1vYlj4n2TLus9h4zW1s/tn/e3iHV55MOXumvUarsvVX
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| 276 | # +OknNGfrr/AK7DbMulLkbZh1VTa8uFSLHF5cqlVt5tW9eWRsH2VbVY10rp+TCu9Q6Rxj2/Ju
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| 277 | # SJE2KG5TqW57848/jS15fXM7mX66ztv7cp16j/FGGr8DdtEN+5uL7sD49WvNOkwGIv5KaS3+
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| 278 | # FsJamLmyFkYmrFnLde6+/4hZl7mOH6yS9SJ9DR5bXwatmLHCrd/PivTxulwlwSJJV8t14n1j
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| 279 | # abIRCfde5mm2iojx/ib2B5eTaeyHl3cPP2N/KNbsx5Op6yw226fg/qbDeIbNc/DoHAR6Mu2I
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| 280 | # dTp+X/zEsTCvGPvK9j0govsrfxqqdJN9cKhMY0vilwdPOebmRwqIy4+x+Tni+Hrc/PKAAnGZ
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| 281 | # 7pXH2fyaYK6X4+B9CcPBt/RRt9z8FoDhoOpH/QJ9j+KAkkf9As2O4oA6N/xy6RWo8OMoqLYN
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| 282 | # 1DDipqo+joIqEGtQqDWJRibXK9oO6igMB1Uu2XeKZwwHlSuO0zue6idVGVE4VQPheeiVIc8F
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| 283 | # sV6Bg6oRx+knkup3Kl8VR+Vb5qGru2N14SNTx2E4qNhwnH1/+chUYRROvfvjeejK6khdeLm/
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| 284 | # +HoFDqolHGfdX17sG5WviqPyLXBQ1WB9D/ULjSvHH9ZXUJOgOKA+UL9AZ1A4dThTftXxTOWh
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| 285 | # qgRs7kI9gF4gwM0fnVfgjo/F19A96T9QSwECFAAUAAAACAC6Gqoso/Hf248DAACrGgAAAwAA
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| 286 | # AAAAAAABACAAAAAAAAAARklMUEsFBgAAAAABAAEAMQAAALADAAAAAA==
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| 287 | # ----GgOuLpDpIyE--1020998322088----
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| 288 | #
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| 289 | #
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| 290 | #
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