[Bug 251775] bsdgrep: egrep regards '{foo}' as invalid regular expression

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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: bugs at FreeBSD.org
          Reporter: yasu at utahime.org
                CC: kevans at 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 at eastasia[1575]% uname -U
1202000
yasu at eastasia[1614]% type egrep
egrep is /usr/bin/egrep
yasu at 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 at eastasia[1616]% echo '{foo}' | egrep '{foo}'
{foo}
yasu at eastasia[1617]%
----------------------------------------------------------------------

But bsdgrep's egrep results in error.

----------------------------------------------------------------------
yasu at rolling-vm-freebsd1[1135]% uname -U
1300131
yasu at rolling-vm-freebsd1[1142]% type egrep
egrep is /usr/bin/egrep
yasu at rolling-vm-freebsd1[1143]% egrep --version
egrep (BSD grep, GNU compatible) 2.6.0-FreeBSD
yasu at rolling-vm-freebsd1[1144]% echo '{foo}' | egrep '{foo}'
egrep: repetition-operator operand invalid
yasu at rolling-vm-freebsd1[1145]%
----------------------------------------------------------------------

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