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Whats Regex Sample Everyday Expression A Way To Use It Don't forget a easy everyday expression this is supposed to extract the closing 4 digits from a string of numbers inclusive of a credit card quantity. the version of the regular expression that uses the * grasping quantifier is b. *([0-9]4)b. but, if a string consists of numbers, this everyday expression fits the last 4 digits of the second one. Regular expressions are styles used to match individual mixtures in strings. in javascript, regular expressions also are objects. these patterns are used with the exec and test strategies of regexp, and with the healthy, matchall, update, search, and break up methods of string. this bankruptcy describes javascript everyday expressions. Unless your regex compiler optimizes options into an o(1) trie structure the manner perl’s does, you must probable be doing a test against hash membership instead. different regex engines just aren’t very smart at this. tchrist nov 5 '11 at 16:26.