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目录

JavaScript String search()

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Examples

Search for "Blue":

let text = "Mr. Blue has a blue house";
let position = text.search("Blue");
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Search for "blue":

let text = "Mr. Blue has a blue house";
let position = text.search("blue");
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Search for /Blue/:

let text = "Mr. Blue has a blue house";
let position = text.search(/Blue/);
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Search for /blue/:

let text = "Mr. Blue has a blue house";
let position = text.search(/blue/);
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Search case insensitive:

let text = "Mr. Blue has a blue house";
let position = text.search(/blue/i);
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Description

The search() method matches a string against a regular expression **

The search() method returns the index (position) of the first match.

The search() method returns -1 if no match is found.

The search() method is case sensitive.

Note

** If the search value is a string, it is converted to a regular expression.

See Also:

Syntax

string.search( searchValue)

Parameters

Parameter Description
searchValue Required.
The search value.
A regular expression (or a string that will be converted to a regular expression).

Return Value

Type Description
A number The position of the first match.
-1 if no match.

The Difference Between
String search() and String indexOf()

The search() cannot take a start position argument.

The indexOf() method cannot search against a regular expression.

The Difference Between
String search() and String match()

The search() method returns the position of the first match.

The match() method returns an array of matches.

Regular Expression Search Methods

In JavaScript, a regular expression text search, can be done with different methods.

With a pattern as a regular expression, these are the most common methods:

Example Description
text.match(pattern) The String method match()
text.search(pattern) The String method search()
pattern.exec(text) The RexExp method exec()
pattern.test(text) The RegExp method test()

Related Pages

JavaScript Strings

JavaScript String Methods

JavaScript String Search

Browser Support

search() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:

Chrome Edge Firefox Safari Opera IE
Yes Yes Yes Yes Yes Yes
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