[TxMt] OT: Perl Compatible Regex problem I can't solve
mats at imediatec.co.uk
Mon Apr 11 09:47:41 UTC 2005
Thanks everyone for your replies. Much appreciated!
Even though I've been working with regex on and off for many years I
still find myself communicating with it in gestures and facial
expressions rather than fluent talk. ;-)
Yes, I am very well aware of the various split on "/", explode() in PHP
and so on implementations, but they are all slightly imperfect
workarounds that I - falsely it turns out - assumed could be cut out
with a single code line of clever regex. Hah! how stupid one can be!
or is it the tools I'm working with ? ;-)
The strings I'm working with follows this general format:
/a/b/c/d/ => (/a/)(b/)(c/)(d/) --> captures all of them
/a/b/c/d => (/a/)(b/)(c/) --> ignore the last bit [ d ] as it does not
have an ending slash
So the regex I would have wanted was something like this (simplified in
(/\w+/)(\w+/)*? returning an array like this ( 1 => "/a/", 2 =>
"b/", 3 => "c/" ) (skipping /d )
I got most of the above working through PHP's preg_match_all() albeit
However, I realised - which is far too often the case when I'm
encountering any problems - that my initial approach was wrong, and
worked around the whole issue, so what I was trying to do is now done
in less code just as I wanted in the first place. :)
The quote of the month was provided by Don Kalar on 7 Apr 2005, at
> "Some people, when confronted with a problem, think "I know, I'll use
> regular expressions." Now they have two problems."
> --Jamie Zawinski, in comp.lang.emacs
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