Sort regex syntax by what it controls

Place each regex token into the behavior bucket it primarily controls. Position or assertion Character set Repetition amount Grouping or capture Engine mode flag ^ at the start of a validation pattern \b around a word-like token \d for a single digit character [^,] for a non-comma character + after a token {2,5} after a class (?[0-9]+) (?:red|blue) i flag for case-insensitive matching m flag changing line-anchor behavior

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