JavaScript String search()
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:
String Methods
| match(pattern) | An Array of results |
| matchAll(pattern) | An Iterator of results |
| replace(pattern, rep) | A new String |
| search(pattern) | Index of the first match |
| split(pattern) | An Array of results |
RegExp Methods
| pattern.exec() | An Iterator of results |
| pattern.test() | true or false |
Browser Support
search() is an ECMAScript1 (JavaScript 1997) feature.
It is supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
