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    Resource Orchestration Service:Fn::MatchPattern

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    Resource Orchestration Service:Fn::MatchPattern

    Last Updated:Jun 17, 2026

    Fn::MatchPattern checks whether a string value matches a regular expression and returns true or false.

    Declaration

    • JSON

      {
  "Fn::MatchPattern": [
    pattern,
    value
  ]
}

    • YAML

      • Syntax for the full function name: 

        Fn::MatchPattern: pattern, value

      • Syntax for the short form: 

        !MatchPattern [pattern, value]

    Parameters

    • pattern: Required. A regular expression of the String type.

    • value: Required. The string value to match against the regular expression.

    Return value

    true or false.

    Examples

    • Fn::MatchPattern:
 - '[a-z]+'
 - adb

      true is returned. 

    • Fn::MatchPattern:
 - '[a-z]+'
 - 12b

      false is returned.