This has a hugeĬost to project maintenance in the long run. Regex string, and are still likely to make mistakes. – Even people who know regex well will take a while to pick apart a new We have multiple times had problems with regexes being too greedy, – It’s extremely easy to match much more than intended, leading toīugs. Non-matching regex can be even more expensive to check than a matching – regex is often the most CPU-intensive part of a program. Don’t solve important problems with regex. In programming, only use regular expressions as a last resort. ‘Some people, when confronted with a problem, think “I know, I’ll use regular expressions.” Now they have two problems.’ – Jamie Zawinski You’ll probably most commonly encounter them used for string matches inĬonditionals that are too complicated for simple logical comparisonsĪ couple of examples of regular expressions to get started: Īny ASCII character (ASCII characters fall between space and “~”) They are available in basically every programming language, and
“a sequence of characters that define a search pattern” Wikipedia defines regular expressions as: There are many like it, but this is mine. It’s an introduction to the basics of regular expressions. This article is basically the content of the class on regular expressions (otherwise known as regex) I gave recently. In my team we run “masterclasses” every couple of weeks, where someone in the team presents a topic to the rest of the team.
This is a direct repost of the original article on my blog.
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