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66 lines
1.7 KiB
66 lines
1.7 KiB
# -*- python -*-
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#
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# $Id: regexps.py,v 1.2 2010-11-11 18:00:01 wirawan Exp $
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#
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# Created: 20101006
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# Wirawan Purwanto
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#
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"""
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Various convenience regular expression tools.
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"""
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import re
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class regex(object):
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"""Single-state regex matcher.
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For quick and dirty matching (single-use, disposable).
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This is intended to make python scripts a bit more convenient to
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use for regexp-intensive matches, just like perl.
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Examples:
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rx = regex(r'deltau = ([0-9.]+)')
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rx2 = regex(r'deltau2 = ([0-9.]+)')
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...
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for text in f:
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if rx % text: # equal to rx.search(text)
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deltau = float(rx[1])
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if rx2 ^ text: # equal to rx.match(text)
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deltau2 = float(rx2[1])
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Note that the regex object must appear as the *LEFT* operand of the
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string being scanned.
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"""
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def __init__(self, pat, flags=0):
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self.rx = re.compile(pat, flags)
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# The following names are the same as standard python re compiled object:
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def match(self, s, flags=0):
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self.m = self.rx.match(s, flags)
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return self.m
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def search(self, s, flags=0):
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self.m = self.rx.search(s, flags)
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return self.m
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# Experimental: using operators instead of names
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# No user-defined flags are possible in this case.
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def __xor__(self, s):
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"""Match the string to the regex at the beginning."""
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self.m = self.rx.match(s)
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return self.m
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def __mod__(self, s):
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"""Match the string to the regex at the any position.
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Too bad python does not have ~= like perl, so we use the
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quirky % or == here.
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And the regex object must be the LEFT operand!"""
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self.m = self.rx.search(s)
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return self.m
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__eq__ = __mod__
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def __getitem__(self, i):
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"""Returns the i-th group from the last match operation."""
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return self.m.group(i)
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