https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251775
Bug ID: 251775
Summary: bsdgrep: egrep regards '{foo}' as invalid regular
expression
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: y...@utahime.org
CC: kev...@freebsd.org
I'm the maintainer of security/logcheck port. It detects log messages that
should be reported by applying regular expressions to each messages with egrep.
After grep is switched to bsdgrep on 13-CURRENT I noticed logcheck produces
some errors caused by egrep. I investigate them and found most of them happens
because regular expressions are invalid according to the definition on
re_format(7). But I also found there is one case that caused by bug of bsdgrep.
In re_format(7) 'bound' is defined as following.
"A bound is '{' followed by an unsigned decimal integer, possibly followed by
',' possibly followed by another unsigned decimal integer, always followed by
'}'. The integers must lie between 0 and RE_DUP_MAX (255) inclusive, and if
there are two of them, the first may not exceed the second."
And there is also following clarification.
" A '{' followed by a character other than a digit is an ordinary character,
not the beginning of a bound. "
So '{100}' is regarded as bound and therefore is invalid as regular expression.
But '{foo}' isn't regarded as bound. Hence it's a valid regular expression and
matches itself.
Gnugrep's egrep works fine with this regular expression.
----------------------------------------------------------------------
yasu@eastasia[1575]% uname -U
1202000
yasu@eastasia[1614]% type egrep
egrep is /usr/bin/egrep
yasu@eastasia[1615]% egrep --version
egrep (GNU grep) 2.5.1-FreeBSD
Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
yasu@eastasia[1616]% echo '{foo}' | egrep '{foo}'
{foo}
yasu@eastasia[1617]%
----------------------------------------------------------------------
But bsdgrep's egrep results in error.
----------------------------------------------------------------------
yasu@rolling-vm-freebsd1[1135]% uname -U
1300131
yasu@rolling-vm-freebsd1[1142]% type egrep
egrep is /usr/bin/egrep
yasu@rolling-vm-freebsd1[1143]% egrep --version
egrep (BSD grep, GNU compatible) 2.6.0-FreeBSD
yasu@rolling-vm-freebsd1[1144]% echo '{foo}' | egrep '{foo}'
egrep: repetition-operator operand invalid
yasu@rolling-vm-freebsd1[1145]%
----------------------------------------------------------------------
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