Do you have a question? Post it now! No Registration Necessary. Now with pictures!
May 22, 2005, 7:22 am
rate this thread
The ? symbol serves a number of purposes in PCRE. The quantifer
minimizer usage is the one I'm currious about. Specifically, the
output from a test script isn't what I'm expecting, and I'm wondering
Here's the script:
Based on my understanding of the quantifer minimizer, the output should
be bc. However, running this results in c being outputted. As such, I
guess I'm just not understanding what ? as a quantifer minimizer is
supposed to do. Could someone explain it to me?
Re: quantifier minimizer
Your understanding of <?> is probably spot on but you've just
overlooked the Kleene Star. There's in fact two replacements
here. The first is the one you expected, the replacement of
<aab> with the empty string. The second is the replacement of
<b> - the second <b>. The quantifier <*> means zero or more;
and so in the second replacement, <.*> matches nothing while
the <b> matches.