Perl Substitution Modifiers

As with the m// operator, the s// operator also allows the use of modifiers:

Modifier	Meaning
e	evaluate the right side as an expression
Perl g-Modifier	replace globally; in other words, all occurrences
i	do case-insensitive pattern matching
m	treat the string as multiple lines
o	only compile the pattern once
s	treat the string as a single line
x	use pretty-printing extensions

The rest of the modifiers work the same as in the m// operator.
This module contains a "Pattern-matching modifiers" lesson and provides an explanation of the m// operator.

Click the Exercise link below to write a program that uses the s// operator to replace all occurrences of one element in a file with another.
Perl s Operator - Exercise