doubt on regex

loki has asked for the wisdom of the Perl Monks concerning the following question:

^\s*[)]*\s*$
[download]

and

^\s*[(]*\s*$
[download]

matches the brackets `(` and `)` which commented as matched. That is, what am trying is to ignore brackets that are single and not (condition1) brackets.. i want to regex to match the brackets which are commented as not matched.. ie 1 or more brackets on the same line..

    while
       (    #matches here
         (  #matches here
          (condition1) && (condition2) && 
           condition3 
        ) || 
        (#matches here
          (condition4) || 
           condition5 && 
           (condition6) 
         ) #matches here

      ) #matches here
[download]

but if I have like this it does not match:

    while
     (( #does not match here
          (condition1) && (condition2) && 
           condition3 
        ) || 
        (
          (condition4) || 
           condition5 && 
           (condition6) 
         ) ) #does not match here
[download]

    while
     ((( #does not match here
          (condition1) && (condition2) && 
           condition3 
        )) || 
        ((  #does not match here
          (condition4) || 
           condition5 && 
           (condition6) 
         ) ) ) #does not match here
[download]

How can I match all the brackets that are single?

Comment on doubt on regex Select or Download Code

Replies are listed 'Best First'.
Re: doubt on regex by Utilitarian (Vicar) on Jan 25, 2010 at 14:33 UTC
The issue is how does a machine determine which parenthesis shouldn't be there? Consider the following code and adapt `my $string="one two one two"; my @ones=$string=~m/\bone\b/g; my @twos=$string=~m/\btwo\b/g; print scalar(@ones) ,"\t\"ones\"\n",scalar (@twos),"\t\"twos\"\n"; print "Equal numbers\n" if (scalar (@ones)== scalar (@twos));'` [download] You can flag that there are unmatched braces on a line, but a human may be needed to determine which is the incorrect brace. Hope this helps `print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."`	[reply] [d/l] [select]
Re: doubt on regex by lidden (Curate) on Jan 25, 2010 at 13:07 UTC
I don't know the answer to your question but see "Question" vs "Doubt".	[reply]
Re: doubt on regex by JavaFan (Canon) on Jan 25, 2010 at 13:48 UTC
You've already mastered "zero-or-more". Are you sure you weren't able to find the syntax for "one-or-more" in the manual? `++++++++++++++++++++++++++++++++++++++++++++++++++++++++`	[reply] [d/l]


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