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How to write a JavaScript regular expression to match an expression?

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Release： 2023-08-26 09:33:13
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How to write a JavaScript regular expression to match an expression?

To match an expression, use the JavaScript match() method. This method is used to retrieve matches when matching a string with a regular expression. The following are the parameters -

  • #param - a regular expression object.

If the regular expression does not contain the g flag, it returns the same result as regexp.exec(string).

If the regular expression contains the g flag, this method returns an array containing all matches.

Example

You can try running the following code to perform mathematical operations on expressions using JavaScript regular expressions -

<html>
   <head>
      <title>JavaScript String match() Method</title>
   </head>
   <body>
      <script>
         var str = "For more information, see Chapter 3.4.5.1";
         var re = /(chapter \d+(\.\d)*)/i;
         var found = str.match( re );

         document.write(found );
      </script>
   </body>
</html>
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source：tutorialspoint.com
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