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This article is about how search() uses regular expressions. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

Using string methods

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

The search() method is used to retrieve a specified substring from a string, or a substring matching a regular expression, and return the start of the substring.

The replace() method is used to replace some characters in a string with others, or to replace a substring that matches a regular expression.

The search() method uses regular expressions

examples

Use regular expressions to search for the "Runoob" string, case insensitive:

varstr="VisitRunoob! ";

varn=str.search(/Runoob/i);

The output is:

6

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