The re Module (cont)
Matching Example
import re
r = re.compile(r'(\d+)\.(\d*)')
m = r.match("42.37")
a = m.group(0) # Returns '42.37'
b = m.group(1) # Returns '42'
c = m.group(2) # Returns '37'
print m.start(2) # Prints 3
A more complex example
# Replace URL such as http://www.python.org with a hyperlink
pat = r'(http://[\w-]+(\.[\w-]+)*((/[\w-~]*)?))'
r = re.compile(pat)
r.sub('<a href="\\1">\\1</a>',s) # Replace in string
Where to go from here?
- Mastering Regular Expressions, by Jeffrey Friedl
- Online docs
- Experiment
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