JS string replacement function replace () detailed introduction

Grammar

Stringobject.replace (regexp/substr,replacement)

Replace
Used to find a string that matches a regular expression, and then use a new string instead of a matching string.

The code is as follows	Copy Code
var result1 = A.replace (Re, "Hello"); RESULT1 = "Hello" var result2 = B.replace (Re, "Hello"); RESULT2 = ", World"

Example 1

The code is as follows	Copy Code
<script language= "JavaScript" > var strm = "JavaScript is a good script language"; Here I want to replace the letter A with the letter A Alert (Strm.replace ("A", "a")); </script>

The substitution above is simple, and we say that replace can be replaced with a regular match.

Example 2

The code is as follows	Copy Code
<script language= "JavaScript" > var strm = "JavaScript is a good script language"; Replace the letter a all with the letter A Alert (Strm.replace (/a/g, "a")); </script>

Replace all characters to replace

Replace the letter I all with 5

code is as follows	copy code
<script language= "javascript" var txt = "Sjfisjfisdjfijsidfjioalfjewofjjgs"; Alert (txt. replace (/i/g, "5")); </script> ///replace only the first letter I with 5 <script language= "javascript" var txt = " Sjfisjfisdjfijsidfjioalfjewofjjgs "; Alert (txt. replace ("I", "5")); </script>