regular expression syntax the same in Python, Perl and grep?

**Chris Mellon** · Nov 7 '07, 07:25 PM

Re: regular expression syntax the same in Python, Perl and grep?

On Nov 7, 2007 12:11 PM, seberino@spawar .navy.mil
<seberino@spawa r.navy.milwrote :

How similar is Python's re module (regular expressions) compared
to Perl's and grep's regular expression syntaxes?
>

Somewhat.

I really hope regular expression syntax is sufficiently standardized
that
we don't have to learn new dialects everytime we move from one
language or shell command to another.
>

It isn't, at least for non-trivial use of regexps.

**Martin Marcher** · Nov 7 '07, 07:45 PM

Re: regular expression syntax the same in Python, Perl and grep?

2007/11/7, Chris Mellon <arkanes@gmail. com>:

On Nov 7, 2007 12:11 PM, seberino@spawar .navy.mil
<seberino@spawa r.navy.milwrote :

How similar is Python's re module (regular expressions) compared
to Perl's and grep's regular expression syntaxes?

>
Somewhat.
>

I really hope regular expression syntax is sufficiently standardized
that
we don't have to learn new dialects everytime we move from one
language or shell command to another.

I forgot where I read that so can't back it up but:

"Unices are just a collection of different dialects of regex"

I think the same is true for about every implementation of regex you
can find. In theory it _should_ be same.

Then again, so should SQL but I bet that it's actually quite hard to
find a single statement that you can literally execute it on all DB
servers (major ones).

--

http://noneisyours.marcher.name

Battery Reconditioning at Home

http://feeds.feedburner.com/NoneIsYours