Perl tutoring: the tutor comments about square brackets in Perl regex.
|Perl regex||match string|
|/[beat24]/||string containing any of b,e,a,t,2,or 4.|
|/beat24/||string containing the exact sequence beat24|
McGrath, Mike. Perl in easy steps. Southam: Computer Step, 2004.Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.