Perl Substitution Modifier(s// operator to replace element)

Lesson 7	Substitution modifiers
Objective	Use the s// operator and appropriate modifiers to replace one element with another in a file.

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.

Perl s Operator - Exercise

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