Re: which regexp require preg_grep() and which can be used with ereg()?

In article <20011005222902.49675.qmail@pb1.pair.com>, jazrant@zsc.nrcan.zc.ca (John A. Grant) wrote: > In Perl I used "/\S/" to check for blank lines read from a file. > Now I'm learning PHP. How do I know what is a 'standard' > regexp that ereg() can handle and how do I know what is > Perl-specific syntax so that I must use preg_grep() instead? The preg_* functions are faster and more powerful than ereg_*. So the main reason to ever use an ereg is because one both unfamiliar with PCRE syntax and uninterested in learning it. You already know Perl regex, so no problem there: you do know PCRE (or will, with a five minute study of the manual to learn the minor differences between Perl and PCRE syntax). If you feel like learning ereg syntax too, google for "POSIX regular expressions", to numerous copies of the relevant man page (regex (6), IIRC..?). You'll find it easy to learn! -- CC