# From laura_fairhead@talk21.com Fri May 10 11:24:41 2002 # Return-Path: # Received: from localhost (aahz [127.0.0.1]) # by skeeve.com (8.11.2/8.11.2) with ESMTP id g4A8OdU01822 # for ; Fri, 10 May 2002 11:24:40 +0300 # Received: from actcom.co.il [192.114.47.1] # by localhost with POP3 (fetchmail-5.7.4) # for arnold@localhost (single-drop); Fri, 10 May 2002 11:24:40 +0300 (IDT) # Received: by actcom.co.il (mbox arobbins) # (with Cubic Circle's cucipop (v1.31 1998/05/13) Fri May 10 11:30:42 2002) # X-From_: laura_fairhead@talk21.com Fri May 10 05:39:57 2002 # Received: from lmail.actcom.co.il by actcom.co.il with ESMTP # (8.11.6/actcom-0.2) id g4A2dpw26380 for ; # Fri, 10 May 2002 05:39:52 +0300 (EET DST) # (rfc931-sender: mail.actcom.co.il [192.114.47.13]) # Received: from f7.net (consort.superb.net [209.61.216.22]) # by lmail.actcom.co.il (8.11.6/8.11.6) with ESMTP id g4A2dxl10851 # for ; Fri, 10 May 2002 05:39:59 +0300 # Received: from fencepost.gnu.org (fencepost.gnu.org [199.232.76.164]) # by f7.net (8.11.6/8.11.6) with ESMTP id g4A2dwN11097 # for ; Thu, 9 May 2002 22:39:58 -0400 # Received: from [194.73.242.6] (helo=wmpmta04-app.mail-store.com) # by fencepost.gnu.org with smtp (Exim 3.34 #1 (Debian)) # id 1760K4-0001QX-00 # for ; Thu, 09 May 2002 22:39:56 -0400 # Received: from wmpmtavirtual ([10.216.84.15]) # by wmpmta04-app.mail-store.com # (InterMail vM.5.01.02.00 201-253-122-103-101-20001108) with SMTP # id <20020510023921.EEW24107.wmpmta04-app.mail-store.com@wmpmtavirtual> # for ; Fri, 10 May 2002 03:39:21 +0100 # Received: from 213.1.102.243 by t21web05-lrs ([10.216.84.15]); Fri, 10 May 02 03:38:42 GMT+01:00 # X-Mailer: talk21 v1.24 - http://talk21.btopenworld.com # From: laura_fairhead@talk21.com # To: bug-gawk@gnu.org # X-Talk21Ref: none # Date: Fri, 10 May 2002 03:38:42 GMT+01:00 # Subject: bug in gawk 3.1.0 regex code # Mime-Version: 1.0 # Content-type: multipart/mixed; boundary="--GgOuLpDpIyE--1020998322088--" # Message-Id: <20020510023921.EEW24107.wmpmta04-app.mail-store.com@wmpmtavirtual> # X-SpamBouncer: 1.4 (10/07/01) # X-SBClass: OK # Status: RO # # Multipart Message Boundary - attachment/bodypart follows: # # # ----GgOuLpDpIyE--1020998322088-- # Content-Type: text/plain # Content-Transfer-Encoding: 7bit # # # I believe I've just found a bug in gawk3.1.0 implementation of # extended regular expressions. It seems to be down to the alternation # operator; when using an end anchor '$' as a subexpression in an # alternation and the entire matched RE is a nul-string it fails # to match the end of string, for example; # # gsub(/$|2/,"x") # print # # input = 12345 # expected output = 1x345x # actual output = 1x345 # # The start anchor '^' always works as expected; # # gsub(/^|2/,"x") # print # # input = 12345 # expected output = x1x345 # actual output = x1x345 # # This was with POSIX compliance enabled althought that doesn't # effect the result. # # I checked on gawk3.0.6 and got exactly the same results however # gawk2.15.6 gives the expected results. # # All the follow platforms produced the same results; # # gawk3.0.6 / Win98 / i386 # gawk3.1.0 / Win98 / i386 # gawk3.0.5 / Linux2.2.16 / i386 # # Complete test results were as follows; # # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # regex input expected actual bug? # ------------------------------------------------------------- # (^) 12345 x12345 x12345 # ($) 12345 12345x 12345x # (^)|($) 12345 x12345x x12345x # ($)|(^) 12345 x12345x x12345x # 2 12345 1x345 1x345 # (^)|2 12345 x1x345 x1x345 # 2|(^) 12345 x1x345 x1x345 # ($)|2 12345 1x345x 1x345 **BUG** # 2|($) 12345 1x345x 1x345 **BUG** # (2)|(^) 12345 x1x345 x1x345 # (^)|(2) 12345 x1x345 x1x345 # (2)|($) 12345 1x345x 1x345 **BUG** # ($)|(2) 12345 1x345x 1x345 **BUG** # ((2)|(^)). 12345 xx45 xx45 # ((^)|(2)). 12345 xx45 xx45 # .((2)|($)) 12345 x34x x34x # .(($)|(2)) 12345 x34x x34x # (^)|6 12345 x12345 x12345 # 6|(^) 12345 x12345 x12345 # ($)|6 12345 12345x 12345x # 6|($) 12345 12345x 12345x # 2|6|(^) 12345 x1x345 x1x345 # 2|(^)|6 12345 x1x345 x1x345 # 6|2|(^) 12345 x1x345 x1x345 # 6|(^)|2 12345 x1x345 x1x345 # (^)|6|2 12345 x1x345 x1x345 # (^)|2|6 12345 x1x345 x1x345 # 2|6|($) 12345 1x345x 1x345 **BUG** # 2|($)|6 12345 1x345x 1x345 **BUG** # 6|2|($) 12345 1x345x 1x345 **BUG** # 6|($)|2 12345 1x345x 1x345 **BUG** # ($)|6|2 12345 1x345x 1x345 **BUG** # ($)|2|6 12345 1x345x 1x345 **BUG** # 2|4|(^) 12345 x1x3x5 x1x3x5 # 2|(^)|4 12345 x1x3x5 x1x3x5 # 4|2|(^) 12345 x1x3x5 x1x3x5 # 4|(^)|2 12345 x1x3x5 x1x3x5 # (^)|4|2 12345 x1x3x5 x1x3x5 # (^)|2|4 12345 x1x3x5 x1x3x5 # 2|4|($) 12345 1x3x5x 1x3x5 **BUG** # 2|($)|4 12345 1x3x5x 1x3x5 **BUG** # 4|2|($) 12345 1x3x5x 1x3x5 **BUG** # 4|($)|2 12345 1x3x5x 1x3x5 **BUG** # ($)|4|2 12345 1x3x5x 1x3x5 **BUG** # ($)|2|4 12345 1x3x5x 1x3x5 **BUG** # x{0}((2)|(^)) 12345 x1x345 x1x345 # x{0}((^)|(2)) 12345 x1x345 x1x345 # x{0}((2)|($)) 12345 1x345x 1x345 **BUG** # x{0}(($)|(2)) 12345 1x345x 1x345 **BUG** # x*((2)|(^)) 12345 x1x345 x1x345 # x*((^)|(2)) 12345 x1x345 x1x345 # x*((2)|($)) 12345 1x345x 1x345 **BUG** # x*(($)|(2)) 12345 1x345x 1x345 **BUG** # x{0}^ 12345 x12345 x12345 # x{0}$ 12345 12345x 12345x # (x{0}^)|2 12345 x1x345 x1x345 # (x{0}$)|2 12345 1x345x 1x345 **BUG** # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # # # Here's the test program I used, a few of the cases use ERE {n[,[m]]} # operators so need '-W posix', (although the same results minus # those tests came out without POSIX compliance enabled) # # [ Invocation was 'gawk -W posix -f tregex.awk' ] # # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # tregex.awk # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ BEGIN{ print _=sprintf("%-20s%-10s%-10s%-10s%-10s\n","regex","input","expected","actual","bug?") OFS="-" $(length(_)+1)="" print $0 #while(getline # # # byefrom # # Laura Fairhead # # # # # -------------------- # talk21 your FREE portable and private address on the net at http://www.talk21.com # ----GgOuLpDpIyE--1020998322088-- # Content-Type: : application/zip;; Name="COPY.ZIP" # Content-Transfer-Encoding: base64 # Content-Disposition: attachment; filename="COPY.ZIP" # # UEsDBBQAAAAIALoaqiyj8d/bjwMAAKsaAAADAAAARklMrVjfa+JAEH4P5H8ISwrRU9EYfbheKBR6 # xRcLvevbYbFtzsqJlBrpQr3722+zMWZ31pk1MaG0Q/m+nR87O9kvruM6/5p4XOc9WSTc05/l # +m2bSivhb8lzmrx43vw53c5X2f+etourHOc63XMe1wlmLQ8+g3AYjaTFD2ZplY9g+xRbWly3 # NPastYMrQN9cs4DvHYz+dHbomY8SOTctGDlcQfXND1Uz6cK3EXcVdpY37ltSuB55u339cNtu # F76NPTudHYR0zS2RZ/sd1maHVLdYI/cp31b2PvFW72jkvIi2tLTI94nXY/eCfeZK8Ap7GO1b # u7QAO8+8FjsLfFx7OowtfW6dLYRv22wZ031uYYc7M/aK5xvEfjp7vDPnQxW2OZuqndDxWeyw # dt6y5rXPt5xrqG8bW9a8tm8ZN1q1UyYTXvNT2HjN7VWLLL3GR7pl9nlUkx1Z+5xm2/qcYsu4 # z2KHtfOWNad6jR92jGN9jvm2sSNbn1vYlj4n2TLus9h4zW1s/tn/e3iHV55MOXumvUarsvVX # +OknNGfrr/AK7DbMulLkbZh1VTa8uFSLHF5cqlVt5tW9eWRsH2VbVY10rp+TCu9Q6Rxj2/Ju # SJE2KG5TqW57848/jS15fXM7mX66ztv7cp16j/FGGr8DdtEN+5uL7sD49WvNOkwGIv5KaS3+ # FsJamLmyFkYmrFnLde6+/4hZl7mOH6yS9SJ9DR5bXwatmLHCrd/PivTxulwlwSJJV8t14n1j # abIRCfde5mm2iojx/ib2B5eTaeyHl3cPP2N/KNbsx5Op6yw226fg/qbDeIbNc/DoHAR6Mu2I # dTp+X/zEsTCvGPvK9j0govsrfxqqdJN9cKhMY0vilwdPOebmRwqIy4+x+Tni+Hrc/PKAAnGZ # 7pXH2fyaYK6X4+B9CcPBt/RRt9z8FoDhoOpH/QJ9j+KAkkf9As2O4oA6N/xy6RWo8OMoqLYN # 1DDipqo+joIqEGtQqDWJRibXK9oO6igMB1Uu2XeKZwwHlSuO0zue6idVGVE4VQPheeiVIc8F # sV6Bg6oRx+knkup3Kl8VR+Vb5qGru2N14SNTx2E4qNhwnH1/+chUYRROvfvjeejK6khdeLm/ # +HoFDqolHGfdX17sG5WviqPyLXBQ1WB9D/ULjSvHH9ZXUJOgOKA+UL9AZ1A4dThTftXxTOWh # qgRs7kI9gF4gwM0fnVfgjo/F19A96T9QSwECFAAUAAAACAC6Gqoso/Hf248DAACrGgAAAwAA # AAAAAAABACAAAAAAAAAARklMUEsFBgAAAAABAAEAMQAAALADAAAAAA== # ----GgOuLpDpIyE--1020998322088---- # # #