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This article mainly shows you "how to use the test () method in JavaScript". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to use the test () method in JavaScript".

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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