![]() And the only way to test for membership is to go to the end of the string and compare the last four characters. csv? Can be quite useful when looking for data files. What about the set of strings that end in. A list of zip codes is finite, consists of rather short strings, and is not particularly challenging computationally. You’ll get a true or false result indicating whether the string belongs to the set of zip codes the regex pattern represents. ![]() Whenever you want to check whether a string is a valid zip code, you can match it against the pattern. Instead of keeping that long and unwieldy list around, it’s often more practical to have a short and precise pattern that completely describes that set. Say we have a list of all valid zip codes. On an abstract level a regular expression, regex for short, is a shorthand representation for a set. You’ll be able to judge when to use them and - more importantly - when not to. After reading this article you will have a solid understanding of what regular expressions are, what they can do, and what they can’t do.
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