Alternation: /John|Karen|Steve/ will match a line containing John or Karen or Steve.

    

# Alternation: this, that, and the other thing
while(<DATA>){
    print if /Mary|Betty|Jon/;
}
__DATA__
    Mary
    Betty Boop
    Mark

1.	Options for the substitution operator.
2.	Replace pattern
3.	Replace pattern with ()
4.	Substitute I with N and print
5.	Substitute N with J
6.	Substitute every T with M
7.	Substitute first T with an M
8.	Substitute first occurrence of "blue" with "red"
9.	Substitute tom with Mary
10.	Substitution Example
11.	Substitution Modifiers
12.	Using substitutions to clean up input data.
13.	Capitalize all sentences
14.	Using Patterns with Substitutions
15.	Changing substitution delimiters
16.	Increase salary with pattern match
17.	Evaluate replacement
18.	Options for the S Operator
19.	Ignore case, global substitution

Alternation: /John|Karen|Steve/ will match a line containing John or Karen or Steve. : substitution « Regular Expression « Perl