How to use the test () method in JavaScript

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Working with RegExp objects

In JavaScript, the RegExp object is a regular expression object with predefined properties and methods.

Use test ()

The test () method is a regular expression method.

The test () method is used to detect whether a string matches a pattern, and returns true if the string contains matching text, otherwise it returns false.

The following example is used to search for the character "e" in the string:

Example

Varpatt=/e/

Patt.test ("Thebestthingsinlifearefree!")

The string contains "e", so the output of the instance is:

True

Instead of setting variables for regular expressions, the above two lines of code can be merged into one line:

/ e/.test ("Thebestthingsinlifearefree!")

Use exec ()

The exec () method is a regular expression method.

The exec () method is used to retrieve the match of a regular expression in a string.

This function returns an array containing the matching results. If no match is found, the return value is null.

The following example searches for the letter "e" in a string:

Example 1

/ e/.exec ("Thebestthingsinlifearefree!")

The string contains "e", so the output of the instance is:

E

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