StructureRegexBuilder5.9.0

    Lookahead

    A regex component that allows a match to continue only if its contents match at the given location.

    iOS
    16.0+
    macOS
    13.0+
    tvOS
    16.0+
    watchOS
    9.0+
    struct Lookahead<Output>

    A lookahead is a zero-length assertion that its included regex matches at a particular position. Lookaheads do not advance the overall matching position in the input string — once a lookahead succeeds, matching continues in the regex from the same position.

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