Trimming a String Using Regular Expressions

  
/*

Learn How to Program Using Any Web Browser
by Harold Davis 

Apress CopyRight 2004

ISBN: 1590591135
*/

<HTML>
<HEAD>
<TITLE>Strim a tring</TITLE>
<SCRIPT> 
function ltrim(testStr) { 
   if (testStr == "") 
      return ""; 
   else { 
      var pattern = /[^\s]+.*/; 
      result = testStr.match(pattern); 
      return result[0]; 
   } 
} 
function rtrim(testStr) { 
   if (testStr == "") 
      return ""; 
   else { 
      var pattern = /.*[\S]/; 
      result = testStr.match(pattern); 
      return result[0]; 
   } 
} 

function trim(testStr) { 
   return rtrim(ltrim(testStr)); 
} 

</SCRIPT>
</HEAD>
<BODY>
<H1> 
Trim a string today! 
</H1>
<FORM name="theForm">
<TABLE>
<tr>
<td colspan=4> 
Enter string for trimming: 
</td>
</tr>
<tr>
<td colspan = 4>
<INPUT type=text name=testStr size=60>
</td>
</tr>
<tr>
<td colspan=3>
<INPUT type=button name="theButton" value="Trim" 
   onClick="document.theForm.display.value = 
   trim(document.theForm.testStr.value)";>
</td>
<td>
<INPUT type=button name="theButton" value="Clear" 
   onClick='document.theForm.testStr.value=""; 
document.theForm.display.value=""'>
</td>
</tr>
<tr>
<td colspan=4>
<br>
<hr> 
Here's the trimmed string: 
<br>
</td>
</tr>
<tr>
<td colspan = 4>
<INPUT type=text name=display size=60>
</td>
</tr>
</TABLE>
</FORM>
</BODY>
</HTML>

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Trimming a String Using Regular Expressions : String « Language Basics « JavaScript DHTML

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