Matching with m//

• Simply matches a string to a pattern:

  	print "Found it!\n" if( $haystack =~ m/needle/ );

• Returns complete string if there's a match, or captured substrings if parenthesis were used.

  e.g. To capture key=value pairs into a hash:

  	%hash = ( $string =~ /(\w+)=(\w+)/g );
  

• In addition to the common modifiers on the earlier slide, m// also allows two more:
  
  

  Modifier	Meaning
  /g	Globally find all matches
  /cg	Allow continued search after a failed /g match

• m//g allows you to keep matching from where you left off:

  	while( m/\b([A-Z][a-z]*)\b/g ) {
  	    print "Found capitalized word $1\n";
  	}