Sets the error buffer and returns -1 if the regex does not compile.

  The returned result is the same as POSIX regex():
  The first value is the complete matched string
  The rest are the substrings that you wanted.
  For example:
  regex(lorem," \([A-Za-z]*\) \([A-Za-z]*\) ",maxMatches=3)
  => {" ipsum dolor ","ipsum","dolor"}
  This means if you have n groups, you want maxMatches=n+1


function regex
  input String str;
  input String re;
  input Integer maxMatches = 1 "The maximum number of matches that will be returned";
  input Boolean extended = true "Use POSIX extended or regular syntax";
  input Boolean caseInsensitive = false;
  output Integer numMatches "-1 is an error, 0 means no match, else returns a number 1..maxMatches";
  output String matchedSubstrings[maxMatches] "unmatched strings are returned as empty";
end regex;

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