Pattern matching

Performs regular expression matching and yields boolean to indicate if there was a match (~) or if there wasn't a match (!~) between candidate and a pattern. If pattern does not evaluate to pattern, it is converted to a string, which is compiled to a pattern.

For regular expressions, see: Regular expressions

  match-expr := exprcandidate "~" exprpattern 
  match-expr := exprcandidate "!~" exprpattern 

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