sed to python: replace Q

[Kam-Hung Soh]

On Wed, 30 Apr 2008 15:27:36 +1000, Raymond <not-for-mail at sonic.net> wrote:

> For some reason I'm unable to grok Python's string.replace() function.
> Just trying to parse a simple IP address, wrapped in square brackets,
> from Postfix logs. In sed this is straightforward given:
>
> line = "date process text [ip] more text"
>
>   sed -e 's/^.*\[//' -e 's/].*$//'
>
> yet the following Python code does nothing:
>
>   line = line.replace('^.*\[', '', 1)
>   line = line.replace('].*$', '')

str.replace() doesn't support regular expressions.

Try:

import re
p = re.compile("^.*\[")
q = re.compile("].*$")
q.sub('',p.sub('', line))

>
> Is there a decent description of string.replace() somewhere?
>
> Raymond

Section 3.6.1 String Functions

-- 
Kam-Hung Soh <a href="http://kamhungsoh.com/blog">Software Salariman</a>