Simple Pattern Matches

To test whether a variable matches a string, use the =~ operator:

$a = 'gatttccaa'; print "contains three t's" if $a =~ /ttt/; print "contains an EcoRI site" if $a =~ /gaattc/

Some Simple Regular Expression Components

Some symbols between the // are special:

^

Matches the beginning of the string.

$

Matches the end of the string.

\w

Matches any single word character (e.g. a-z, A-Z, 0-9).

\w+

Matches one or more word characters.

\d

Matches a single digit.

\d+

Matches one or more digits.

  $a = '367-8380';
  print "This is an OK telephone number.\n" if $a =~ /^\d\d\d-\d\d\d\d$/;

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