[Bug regex/10106] one or more match problem?

[Bug regex/10106] one or more match problem?

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=10106

Florian Weimer <fweimer at redhat dot com> changed:

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              Flags|                            |security-

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[Bug regex/10106] New: one or more match problem?

[gzljg at hotmail dot com]

I try to get a non-empty string that separated by a comma(,) for example, 

for the line :   ,ABC,                /// --> I want to get "ABC"
for the line :   ,,                   /// --> I want to report a 'not match'

So I try to use the regular expression as :   ,\([^,]+\),
this wouldn't match though?  I had to change to ",\([^,]*\)," but then this
would also match a "empty" string in case 2 above.

Any idea?

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           Summary: one or more match problem?
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: regex
        AssignedTo: drepper at redhat dot com
        ReportedBy: gzljg at hotmail dot com
                CC: glibc-bugs-regex at sources dot redhat dot com,glibc-
                    bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10106

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[Bug regex/10106] one or more match problem?

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2009-04-27 15:19 -------
This is no programming advice site.  Either you provide a complete small test
program and cite the passage from the standard you think is violated or you go away.

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[Bug regex/10106] one or more match problem?

[bonzini at gnu dot org]

------- Additional Comments From bonzini at gnu dot org  2009-04-27 15:29 -------
I think you want either ,\([^,]\+\), with basic syntax, or ,([^,]+), plus
setting extended syntax.

Thus, invalid.

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         Resolution|                            |INVALID


http://sourceware.org/bugzilla/show_bug.cgi?id=10106

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[Bug regex/10106] one or more match problem?

[gzljg at hotmail dot com]

------- Additional Comments From gzljg at hotmail dot com  2009-04-27 15:48 -------
Created an attachment (id=3910)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=3910&action=view)
compile the file and run.

According to the "regex" doc quoted below, it should work, but it doesn't-->
 3.4.2 The Match-one-or-more Operator (+ or \+)

If the syntax bit RE_LIMITED_OPS is set, then Regex doesn't recognize this
operator. Otherwise, if the syntax bit RE_BK_PLUS_QM isn't set, then `+'
represents this operator; if it is, then `\+' does.

This operator is similar to the match-zero-or-more operator except that it
repeats the preceding regular expression at least once; see section 3.4.1 The
Match-zero-or-more Operator (*), for what it operates on, how some syntax bits
affect it, and how Regex backtracks to match it.

For example, supposing that `+' represents the match-one-or-more operator; then
`ca+r' matches, e.g., `car' and `caaaar', but not `cr'. 


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[Bug regex/10106] one or more match problem?

[gzljg at hotmail dot com]

------- Additional Comments From gzljg at hotmail dot com  2009-04-27 15:52 -------
(In reply to comment #2)
> I think you want either ,\([^,]\+\), with basic syntax, or ,([^,]+), plus
> setting extended syntax.
> 
> Thus, invalid.

thanks Paolo, I try to use ",\([^,]\+\)," as you suggested but it still failed
for the basic syntax? Does it means I have to use the extended syntax?

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[Bug regex/10106] one or more match problem?

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2009-04-27 16:08 -------
Have you tried to even compile your testcase?  regexp.h != regex.h
",\\([^,]\\+\\),"
works just fine.

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[Bug regex/10106] one or more match problem?

[gzljg at hotmail dot com]

------- Additional Comments From gzljg at hotmail dot com  2009-04-27 17:30 -------
Yes, I did. "regexp.h" is my wrapper header file...I should not have included it
in the test case.   Anyway, I tried to use <regex.h> now, and it still gives me
the same output "not match found"?

what output you have? any special compile option I should use?

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[Bug regex/10106] one or more match problem?

[gzljg at hotmail dot com]

------- Additional Comments From gzljg at hotmail dot com  2009-04-28 15:31 -------
Created an attachment (id=3914)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=3914&action=view)
revised version

to compile:
CC RegExpTest.C 
to run (not match case):
./a.out
to run (match case):
./a.out 1

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