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Introduction to Python (by Ilan Schnell) |
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Introduction to Python (by Ilan Schnell) |
The re module and provides Perl-style regular expression patterns.
For an introduction, I recommend A.M. Kuchling's howto.
Say we wish to have a program that tells us whether an email address (in its first argument) is syntactically valid.
#!/usr/bin/python
import sys, re
pattern = re.compile(r'^[\w.-]+@[\w.-]+\.[A-Z]{2,4}$', re.I)
if pattern.match(sys.argv[1]):
print "OK"
else:
print "Something is wrong with this email address."
Here is how you invoke the program:
$ ./regex.py guido@google.com
OK
$ ./regex.py george.whitehouse.gov
Something is wrong with this email address.