The Regular Expression (RegEx) Cheat Sheet you always wanted

I get it even though Regex is incredibly useful, it is extremely hard to master! This is a cheat sheet that provides the most common RegEx use cases that will help you whenever need a sneak peek at the Regex syntax!

NOTE: Medium doesn’t support a native tables, so the tables below are screenshots. If you want it in tabular format, check out my blog on Dev

Characters

Assertions

Groups

Quantifiers

NOTE

By default quantifiers are greedy (they try to match as much of the string as possible). The ? character after the quantifier makes the quantifier non-greedy (it will stop as soon as it finds a match).

For Example: \d+? for a test string 12345 will match only 1, but \d+ will match the entire string 12345

Flags

Flags are put at the end of the regular expression. They are used to modify how the regular expression behaves.

For Example: /a/ for a test string a will match a only, but adding the flag i (/a/i) would match both a and A

That’s all folks!

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