I try to write my regexen backtracking-free, as, I believe, anyone should. And in that case greediness is very desired and useful most of the time. Non-greediness basically means that you match broader than you really need to - it works because you "forwardtrack", you gobble the string one submatch at a time. It is better to match more narrowly and greedily, since a greedy match will gobble up a lot of the string in one fell swoop and do less superfluous searching. In simple cases the regex optimizer is smart enough to simplify a non-greedy match into a Boyer-Moore search, but when you're working with a complex regex you really want to match narrowly and greedily.
Regexen are a tricky art.
Makeshifts last the longest.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||