What is the purpose of special characters in JavaScript regular expressions?-HTML Tutorial-php.cn

What is the purpose of special characters in JavaScript regular expressions?

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Release： 2023-08-20 14:57:23

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What is the purpose of special characters in JavaScript regular expressions?

Character sequences and individual characters whose frequency or position are enclosed in parentheses can be represented by special characters. Each special character has a specific meaning. The , *, ? and $ signs all follow a sequence of characters.

56##p{2, }7p$8^pExample

Serial number	Expression and description
1	p It matches any string containing one or more p.
2	p* It matches anything containing zero A string of one or more p's.
3	p? It matches anything containing up to A string of p.
4	##p{N}It matches any A string containing N p
	p{2 ,3}It matches any string containing two or three p's.
	It matches Any string containing at least two p's.
	It matches ending with p any string.
	It matches starting with p any string.

You can try running the following code to understand how to use special characters in JavaScript regular expressions-

<html>
   <head>
      <title>JavaScript Regular Expressions</title>
   </head>
   <body>
      <script>
         var myStr = "Welcome to our website! Welcome to Tutorialspoint!";
         var reg = /Wel*/g;

         var match = myStr.match(reg);

         document.write(match);
      </script>
   </body>
</html>

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