Regular expression calculator online. Instantly see matches and capture groups.

Regular expression calculator online. Generate Regex from plain English for free.

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Expression Flags ignore case (i) global (g) multiline (m) extended (x) extra (X) single line (s) unicode (u) Ungreedy (U) Anchored (A) dup subpattern names(J) More About Using the Calculator Memory. Use light Regex tester helps you to test and validate regular expressions online for free. @Bergi One would need to minimize regular expressions for the same reasons anyone needs to write code that is more succinct (though not necessarily faster). Regular Expression flags; Test String. Next, click Create automaton to create a FSM for the defined regex and display its transition graph. The regular expressions supported by this tool may contain: Letters (a-z, A-Z) The quantifiers *, meaning 0 or more of the previous token, and +, meaning 1 or more of the previous token; Alternation |, meaning either the expression to the left or to the right of the | has to match. Regexr101; Flavors. 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