My tools of the trade for python programming.
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# -*- python -*-
# $Id:,v 1.1 2010-10-06 16:37:42 wirawan Exp $
# Created: 20101006
# Wirawan Purwanto
Various convenience regular expression tools.
import re
class regex(object):
"""Single-state regex matcher.
For quick and dirty matching (single-use, disposable).
This is intended to make python scripts a bit more convenient to
use for regexp-intensive matches, just like perl.
rx = regex(r'deltau = ([0-9.]+)')
rx2 = regex(r'deltau2 = ([0-9.]+)')
for text in f:
if rx % text: # equal to
deltau = float(rx[1])
if rx2 ^ text: # equal to rx.match(text)
deltau2 = float(rx2[1])
Note that the regex object must appear as the *LEFT* operand of the
string being scanned.
def __init__(self, pat, flags=0):
self.rx = re.compile(pat, flags)
# The following names are the same as standard python re compiled object:
def match(self, s, flags=0):
self.m = self.rx.match(s, flags)
return self.m
def search(self, s, flags=0):
self.m =, flags)
return self.m
# Experimental: using operators instead of names
# No user-defined flags are possible in this case.
def __xor__(self, s):
"""Match the string to the regex at the beginning."""
self.m = self.rx.match(s)
return self.m
def __mod__(self, s):
"""Match the string to the regex at the any position.
Too bad python does not have ~= like perl, so we use the
quirky % or == here."""
self.m =
return self.m
__eq__ = __mod__
def __getitem__(self, i):
"""Returns the i-th group from the last match operation."""