var re = /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}$/;
re.test('1234-12-12 12:12');

var re = /.*\/(.*)\.js$/gi;
var a = re.exec('foo/bar.js');
// ["foo/bar.js", "bar"]

var str = "qwertyuiop";
str.replace(/(we|ty|io)/gim, "!$&!");
// "q!we!r!ty!u!io!p"

import re
pattern = re.compile(r'(\d) (\d) (\d)')
match = pattern.search('1 2 3', pattern)
match.group(1, 2, 3)
# ('1', '2', '3')

:'<,'>s/src="\([./[:alnum:]_-]*\)"/src="\1"/gc
:'<,'>s/<option value="\(\d\+\)">\(.\+\)<\/option>/(\1, '\2'),/g
:'<,'>s/\s\*//gc