grep
yield items matching a pattern
Usage
<iterable> | grep(<test>…)grep(<test>, <iterable>…)
test is:
- a regular expression;
- or a single argument function.
Examples
>>> from grapevine import *
>>> grep('a[rz]', ['foo', 'bar', 'baz']) | tuple
('bar', 'baz')
>>> xrange(-10, 10) | grep(lambda x: x % 7 == 1) | tuple
(-6, 1, 8)