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This article mainly introduces the relevant knowledge of "how to use RegExp objects in JavaScript". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to use RegExp objects in JavaScript" can help you solve the problem.

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

Use test ()

Test () is a regular expression method.

It searches for strings through patterns and then returns true or false based on the results.

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

Example

Var patt = / e /

Patt.test ("The best things in life are free!")

Since there is an "e" in the string, the output of the above code will be:

True

You don't have to put the regular expression in the variable first. The above two lines can be shortened to one line:

/ e/.test ("The best things in life are free!")

Use exec ()

The exec () method is a regular expression method.

It searches for a string through the specified pattern (pattern) and returns the found text.

If no match is found, null is returned.

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

Example

/ e/.exec ("The best things in life are free!")

Since there is an "e" in the string, the output of the above code will be:

E

This is the end of the introduction to "how to use RegExp objects in JavaScript". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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