06-11-2012
Quote:
Originally Posted by
jim mcnamara
See 'Mastering Regular Expressions' J Friedl
There are different regex engines, and modalities. It is a pain in the butt if you don't know what works with what regex engine. Book lists grep, egrep, perl, etc. and has a tables of these things.
A universal standard is not possible, AFAIK, at this time.
That's actually the book I got the example from. It's not always clear - at least to me - which standard is being referred to in all examples. I suppose that will come... Standards are possible, of course - you just gotta get people to adopt 'em. ; )
---------- Post updated at 12:56 PM ---------- Previous update was at 12:38 PM ----------
Quote:
Originally Posted by
alister
If it helps, these days you only need to know
grep.
egrep is equivalent to
grep -E and
fgrep is equivalent to
grep -F.
That made me laugh aloud. Thank you.
Regards,
Alister
Glad I can contribute
something to this forum. ; )
But it turns out that GNU grep is different from the grep you get in a standard unix installation. As you might imagine, it took me a while to figure out why certain examples - which I copied very carefully - still wouldn't work. But I serendipitously ran across that info reading about something else.
I am having the same problem now with perl - but that's another thread for another day!
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