JavaScript String replace() Method

　JavaScript String Object

replace()The method is used to replace some characters with other characters in a string, or to replace a substring that matches a regular expression.

The pattern can be a string or a regular expression, and the replacement can be a string or a function called for each match.

If the pattern is a string, only the first match will be replaced.

To replace all occurrences of the specified value, usegModifiers (global search) (see the following 'More Examples').

You can find inRegExp tutorialandReference in RegExp objectsLearn more about regular expressions.

Note:This method does not change the original string value.

Syntax:

string.replace(oldValue,　newValue)

var　str1　=　'The question is to be, or not to be, that is to be.';
var　str2　=　str1.replace('to　be'　'ZZZ');

Browser compatibility

All browsers fully support the replace() method:

Parameter Value

Technical Details

More Examples

The following examples demonstrate the use of globalgModifiers used with replace():

var　str1　=　'The question is to be, or not to be, that is to be.';
var　str2　=　str1.replace(/to　be/g,　'ZZZ');

The following examples demonstrate how to use the global and ignore case modifiers with replace():

var　str1　=　'The question is TO BE, or not to be, that is to be.';
var　str2　=　str1.replace(/to　be/gi,　'ZZZ');

　JavaScript String Object