Using regular expressions in JavaScript to delete spaces in a string

Instance

The code is as follows	Copy Code
<script> var str= "yexj00"; Str=str.replace (/^s*|s*$/g, ""); alert (str); </script>

Instance

Imitation RTrim:

The code is as follows	Copy Code
<script> var str= "yexj00"; Str=str.replace (/s*$/g, ""); alert (str); </script>

Instance

The code and test code are as follows:

The code is as follows

Copy Code

< The script type= "Text/javascript" >  //deletes white space characters on either side of the string.  function Trim (str) {   return str.replace (/^s+|s+$/g, ');  } The  //deletes the white space character to the left of the string.  function LTrim (str) {   return str.replace (/^s+/g, ');  } The  //deletes the white space character to the right of the string.  function RTrim (str) {   return str.replace (/s+$/g, ');  }  //The following is the test code  var trimtest = "123456789"; There is a space before and after.  document.write (' Length: ' +trimtest.length+ ' <br/> '); //before use  document.write (' LTrim length: ' +ltrim (trimtest). length+ ' <br/> '); //Use LTrim after  document.write (' RTrim length: ' +rtrim (trimtest). length+ ' <br/> '); //After using RTrim  document.write (' Trim length: ' +trim (trimtest). length+ ' <br/> '); //after using trim  </script>

The results of the test are as follows:

The code is as follows	Copy Code
Length:11 LTrim length:10 RTrim Length:10 Trim Length:9