Regular Expressions

Match Patterns ("?")

• The symbol "?" is a multiplier that indicates match zero or one instance of the previous item .
• Example:
  

  $theVar = "This is a test.  Beeeeeeeeeeeeeeep";
  if ($theVar =~ /be?p/) {
      (print "Match One\n");  # Would Not Match
  }
  if ($theVar =~ /Be?p/) {
      (print "Match Two\n");  # Would Not Match
  }
  if ($theVar =~ /t?e?p/) {
      (print "Match Three\n");  # Would Match
  }
  if ($theVar =~ /[tT]?his/) {
      (print "Match Three\n");  # Would Match
  }