Options to the Regular Expression Operators

There are a number of options, represented by letters placed after the closing character of the regular expression operators, that modify the behavior of the operator in a number of useful ways. These options are summarized in Table .

Table: Options for regular expression operators

Option	Meaning
i	Make search case insensitive.
g	Operate on all occurences of matches, not just the first.
s	Allow . to match newline.
e	(with s operator)Treat substituted text as a perl expression.
x	Ignore whitespace and comments inside the regular expression.