242 lines
5.4 KiB
Awk
242 lines
5.4 KiB
Awk
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#From arnold Thu May 9 17:27:03 2002
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#Return-Path: <arnold@skeeve.com>
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#Received: (from arnold@localhost)
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# by skeeve.com (8.11.6/8.11.6) id g49ER3K27925
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# for arnold; Thu, 9 May 2002 17:27:03 +0300
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#Date: Thu, 9 May 2002 17:27:03 +0300
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#From: Aharon Robbins <arnold@skeeve.com>
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#Message-Id: <200205091427.g49ER3K27925@skeeve.com>
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#To: arnold@skeeve.com
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#Subject: fixme
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#X-SpamBouncer: 1.4 (10/07/01)
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#X-SBRule: Pattern Match (Other Patterns) (Score: 4850)
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#X-SBRule: Pattern Match (Spam Phone #) (Score: 0)
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#X-SBClass: Blocked
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#Status: O
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#
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#Path: ord-read.news.verio.net!dfw-artgen!iad-peer.news.verio.net!news.verio.net!fu-berlin.de!uni-berlin.de!host213-120-137-48.in-addr.btopenworld.COM!not-for-mail
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#From: laura@madonnaweb.com (laura fairhead)
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#Newsgroups: comp.lang.awk
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#Subject: bug in gawk3.1.0 regex code
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#Date: Wed, 08 May 2002 23:31:40 GMT
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#Organization: that'll be the daewooo :)
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#Lines: 211
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#Message-ID: <3cd9b0f7.29675926@NEWS.CIS.DFN.DE>
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#Reply-To: laura@madonnaweb.com
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#NNTP-Posting-Host: host213-120-137-48.in-addr.btopenworld.com (213.120.137.48)
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#X-Trace: fu-berlin.de 1020900891 18168286 213.120.137.48 (16 [53286])
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#X-Newsreader: Forte Free Agent 1.21/32.243
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#Xref: dfw-artgen comp.lang.awk:13059
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#
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#
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#I believe I've just found a bug in gawk3.1.0 implementation of
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#extended regular expressions. It seems to be down to the alternation
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#operator; when using an end anchor '$' as a subexpression in an
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#alternation and the entire matched RE is a nul-string it fails
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#to match the end of string, for example;
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#
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#gsub(/$|2/,"x")
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#print
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#
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#input = 12345
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#expected output = 1x345x
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#actual output = 1x345
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#
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#The start anchor '^' always works as expected;
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#
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#gsub(/^|2/,"x")
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#print
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#
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#input = 12345
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#expected output = x1x345
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#actual output = x1x345
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#
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#This was with POSIX compliance enabled althought that doesn't
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#effect the result.
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#
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#I checked on gawk3.0.6 and got exactly the same results however
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#gawk2.15.6 gives the expected results.
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#
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#I'm about to post a bug report about this into gnu.utils.bug
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#but I thought I'd post it here first in case anyone has
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#any input/comments/whatever ....
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#
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#Complete test results were as follows;
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#
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#input 12345
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#output gsub(/regex/,"x",input)
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#
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#regex output
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#(^) x12345
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#($) 12345x
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#(^)|($) x12345x
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#($)|(^) x12345x
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#(2) 1x345
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#(^)|2 x1x345
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#2|(^) x1x345
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#($)|2 1x345
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#2|($) 1x345
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#(2)|(^) x1x345
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#(^)|(2) x1x345
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#(2)|($) 1x345
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#($)|(2) 1x345
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#.((2)|(^)) x345
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#.((^)|(2)) x345
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#.((2)|($)) x34x
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#.(($)|(2)) x34x
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#x{0}((2)|(^)) x1x345
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#x{0}((^)|(2)) x1x345
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#x{0}((2)|($)) 1x345
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#x{0}(($)|(2)) 1x345
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#x*((2)|(^)) x1x345
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#x*((^)|(2)) x1x345
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#x*((2)|($)) 1x345
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#x*(($)|(2)) 1x345
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#
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#Here's the test program I used, a few of the cases use ERE {n[,[m]]}
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#operators so that will have to be commented out or have a check
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#added or something (should have put a conditional in I know... ;-)
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#
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#
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BEGIN{
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TESTSTR="12345"
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print "input "TESTSTR
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print "output gsub(/regex/,\"x\",input)"
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print ""
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print "regex output"
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$0=TESTSTR
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gsub(/(^)/,"x")
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print "(^) "$0
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$0=TESTSTR
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gsub(/($)/,"x")
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print "($) "$0
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$0=TESTSTR
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gsub(/(^)|($)/,"x")
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print "(^)|($) "$0
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$0=TESTSTR
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gsub(/($)|(^)/,"x")
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print "($)|(^) "$0
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$0=TESTSTR
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gsub(/2/,"x")
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print "(2) "$0
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$0=TESTSTR
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gsub(/(^)|2/,"x")
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print "(^)|2 "$0
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$0=TESTSTR
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gsub(/2|(^)/,"x")
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print "2|(^) "$0
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$0=TESTSTR
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gsub(/($)|2/,"x")
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print "($)|2 "$0
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$0=TESTSTR
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gsub(/2|($)/,"x")
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print "2|($) "$0
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$0=TESTSTR
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gsub(/(2)|(^)/,"x")
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print "(2)|(^) "$0
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$0=TESTSTR
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gsub(/(^)|(2)/,"x")
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print "(^)|(2) "$0
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$0=TESTSTR
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gsub(/(2)|($)/,"x")
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print "(2)|($) "$0
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$0=TESTSTR
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gsub(/($)|(2)/,"x")
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print "($)|(2) "$0
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$0=TESTSTR
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gsub(/.((2)|(^))/,"x")
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print ".((2)|(^)) "$0
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$0=TESTSTR
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gsub(/.((^)|(2))/,"x")
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print ".((^)|(2)) "$0
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$0=TESTSTR
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gsub(/.((2)|($))/,"x")
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print ".((2)|($)) "$0
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$0=TESTSTR
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gsub(/.(($)|(2))/,"x")
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print ".(($)|(2)) "$0
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# $0=TESTSTR
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# gsub(/x{0}((2)|(^))/,"x")
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# print "x{0}((2)|(^)) "$0
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#
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# $0=TESTSTR
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# gsub(/x{0}((^)|(2))/,"x")
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# print "x{0}((^)|(2)) "$0
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#
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# $0=TESTSTR
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# gsub(/x{0}((2)|($))/,"x")
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# print "x{0}((2)|($)) "$0
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#
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# $0=TESTSTR
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# gsub(/x{0}(($)|(2))/,"x")
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# print "x{0}(($)|(2)) "$0
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$0=TESTSTR
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gsub(/x*((2)|(^))/,"x")
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print "x*((2)|(^)) "$0
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$0=TESTSTR
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gsub(/x*((^)|(2))/,"x")
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print "x*((^)|(2)) "$0
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$0=TESTSTR
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gsub(/x*((2)|($))/,"x")
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print "x*((2)|($)) "$0
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$0=TESTSTR
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gsub(/x*(($)|(2))/,"x")
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print "x*(($)|(2)) "$0
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# $0=TESTSTR
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# gsub(/x{0}^/,"x")
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# print "x{0}^ "$0
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#
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# $0=TESTSTR
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# gsub(/x{0}$/,"x")
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# print "x{0}$ "$0
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#
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# $0=TESTSTR
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# gsub(/(x{0}^)|2/,"x")
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# print "(x{0}^)|2 "$0
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#
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# $0=TESTSTR
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# gsub(/(x{0}$)|2/,"x")
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# print "(x{0}$)|2 "$0
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}
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#
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#
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#byefrom
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#
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#--
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#laura fairhead # laura@madonnaweb.com http://lf.8k.com
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# # if you are bored crack my sig.
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#1F8B0808CABB793C0000666667002D8E410E83300C04EF91F2877D00CA138A7A
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#EAA98F30C494480157B623C4EF1B508FDED1CEFA9152A23DE35D661593C5318E
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#630C313CD701BE92E390563326EE17A3CA818F5266E4C2461547F1F5267659CA
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#8EE2092F76C329ED02CA430C5373CC62FF94BAC6210B36D9F9BC4AB53378D978
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#80F2978A1A6E5D6F5133B67B6113178DC1059526698AFE5C17A5187E7D930492
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