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Today, the editor will share with you the relevant knowledge points about how to use JavaScript's search and replace. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

How to use JavaScript regular search,replace

In JavaScript, regular expressions are commonly used in two string methods: search () and replace ().

The search () method uses an expression to search for a match and then returns the location of the match.

The replace () method returns the modified string where the pattern was replaced.

Use the string method search () to process strings

The search () method also accepts a string as a search parameter. The string parameter is converted to a regular expression:

Example

Use a string to perform a search for "W3school":

Var str = "Visit W3School!"

Var n = str.search ("W3School")

Using regular expressions in the string method search ()

Example

Use regular expressions to perform a case-insensitive search for "w3school" in the search string:

Var str = "Visit W3School"

Var n = str.search (/ w3school/i)

The result in n will be:

Use the string method replace () to process strings

Replace () also accepts a string as a search parameter:

Var str = "Visit Microsoft!"

Var res = str.replace ("Microsoft", "W3School")

Using regular expressions in the string method replace ()

Example

Replace the Microsoft in the string with W3school with an unknown case of regular expression:

Var str = "Visit Microsoft!"

Var res = str.replace (/ microsoft/i, "yisu")

The result of res will be:

Visit yisu!

These are all the contents of the article "how to use JavaScript's search and replace". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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