On Wed, 30 Apr 2008 17:12:15 +1000, Kam-Hung Soh <[EMAIL PROTECTED]>
wrote:
On Wed, 30 Apr 2008 15:27:36 +1000, Raymond <[EMAIL PROTECTED]>
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))
Another approach is to use the split() function in "re" module.
import re
re.split("[\[\]]", line)[1]
See http://docs.python.org/lib/node46.html
--
Kam-Hung Soh <a href="http://kamhungsoh.com/blog";>Software Salariman</a>
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