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Hi,

I'm having trouble modifying the regular expression /^\{.*\}$/ so that a
string with nested curly braces is deemed unmatched. E.g

{recognizing syntax} - matched
{recognizing syntax {foo} bar} - unmatched.
{recognizing syntax {foo{ foo bar}} {bar}} - unmatched.

Can this be done?

Cheers!

use warnings;
use strict;

while (<>) {
chomp;
if (/^\{.*\}$/) {
print "Matched: |$`<$&>$'|\n";
} else {
print "No match.\n";
}
}

Gyruss wrote:
> I'm having trouble modifying the regular expression /^\{.*\}$/ so that a
> string with nested curly braces is deemed unmatched. E.g
>
> {recognizing syntax} - matched
> {recognizing syntax {foo} bar} - unmatched.
> {recognizing syntax {foo{ foo bar}} {bar}} - unmatched.

/^{[^{}]*}$/

--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl

Gyruss wrote:
> Hi,
>
> I'm having trouble modifying the regular expression /^\{.*\}$/ so that a
> string with nested curly braces is deemed unmatched. E.g
>
> {recognizing syntax} - matched
> {recognizing syntax {foo} bar} - unmatched.
> {recognizing syntax {foo{ foo bar}} {bar}} - unmatched.
>
> Can this be done?

Can your criteria be expressed as "a string containing another '{'
character is unmatched?" (If not how are your criteria different).

/^{[^{]*}$/