Alternation

• The | character is used to specify alternative expressions

• Basically an OR function for regex's

$class =~ /wm112|wm113/;

$class =~ /(wm112|wm113)/;print "The class is $1";

$class =~ /wm112|wm113/;

$class =~ /(wm112|wm113)/;

print "The class is $1";

This works well with parentheses:

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