Date: Thu, 18 Apr 2002 23:18:46 -0700 (PDT) From: Wesley Irish <wirish@coyotehillconsulting.com> To: freebsd-gnats-submit@FreeBSD.org Subject: ports/37241: character ranges in regular expressions in nawk match one beyond the given range Message-ID: <200204190618.g3J6Ik430208@freefall.freebsd.org>
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>Number: 37241
>Category: ports
>Synopsis: character ranges in regular expressions in nawk match one beyond the given range
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-ports
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Apr 18 23:20:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Wesley Irish
>Release: 4.4-RELEASE
>Organization:
Coyote Hill Consulting LLC
>Environment:
FreeBSD wilee.coyotehillconsulting.com 4.4-RELEASE FreeBSD 4.4-RELEASE #0: Tue Sep 18 11:57:08 PDT 2001 murray@builder.FreeBSD.org:/usr/src/sys/compile/GENERIC i386
>Description:
Character ranges in regular expression patterns are incorrect. They extend one beyond the intended end of the range. I have tested this for [0-9], [a-z], and [A-Z] (just to mention a few). I have also tested multiple ranges, such as [a-zA-Z] and the problem applies to both ranges within the same pattern. The pattern [a-zA-Z] matches latters and the characters "[" and "{".
I am running nawk: PORTVERSION= 20001115
>How-To-Repeat:
run the command:
nawk '{printf("\"%s\" ~ \"%s\" == %s\n", $1, $2, $1 ~ $2)}'
This one-liner will simply check if the first argument is matched by the second argument. Enter the following data to test for the problem:
0 [0-9]
9 [0-9]
: [0-9]
; [0-9]
/ [0-9]
You will see that "0" and "9" match (as they should).
But you will also see that ":" matches as well, which it souldn't.
The ";" does not match as the problem extends only "one beyond" the range. The "/" does not match indicating that there does not appear to be a problem at the beginning of the range.
>Fix:
Presently VERY awkward as all character ranges must be modified on the source to be one less than intended, such as [A-Y], or explicitly enumberated.
I appologize in advance if the problem is due to me not running the very latest version of FreeBSD & ports or this is an already known and fixed bug. I tried to check a bug report log but I must not know how / where to check. If this is the case a pointer to such would be greatly appreciated. Thank you.
>Release-Note:
>Audit-Trail:
>Unformatted:
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