I found my self want to express -string- in -list of regular expressions- and so I wrote this quick object to do the trick for me. It takes a list of strings containing regular expressions, compiles them into an internal list and then using the __contains__ operation ("in") looks to see if a given string contains any of the expressions. The first success returns True otherwise it returns False.
Python, 25 lines
Download
Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | import re
class PatternList( object ):
"""A Patternlist is a list of regular expressions. the 'in' operator
allows a string to be compared against each expression (using search
NOT match)"""
def __init__(self , patterns = []):
self.patterns = []
for p in patterns:
self.add( p )
def add( self , pattern ):
pat = re.compile( pattern )
self.patterns.append( pat )
def __contains__(self , item ):
ret = False
for p in self.patterns:
if p.search( item ):
ret= True
break
return ret
if __name__=="__main__":
examplelist = PatternList( [ ".*txt$" , ".*doc$" ])
assert( "test.txt" in examplelist )
assert( "test.xls" not in examplelist )
|
The main object was to make my code read cleanly.
Tags: search
