perl compatible regular expressions

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All these functions are preg_quote ( ), preg_grep ( ), preg_split ( ), preg_match_all ( ) example of

All these functions are preg_quote ( ), preg_grep ( ), preg_split ( ), preg_match_all ( ) example of
  • A. POSIX style regex
  • B. Competent style regex
  • C. Perl compatible style regex
  • D. None of them
  • Correct Answer: Option C