def grep(*matches):
"""Returns a generator function that operates on an iterable:
filters items in the iterable that match any of the patterns.
match: a callable returning a True value if it matches the item
>>> import re
>>> input = ["alpha\n", "beta\n", "gamma\n", "delta\n"]
>>> list(grep(re.compile('b').match)(input))
['beta\n']
"""
def _do_grep_wrapper(*matches):
def _do_grep(lines):
for line in lines:
for match in matches:
if match(line):
yield line
break
return _do_grep
return _do_grep_wrapper(*matches)
