JavaScript Tutorial/Regular Expressions/Filter

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Bad word filter

   <source lang="javascript">

<html> <head> 

   <title>Bad Words Example</title>
   <script type="text/javascript">
           function filterText(sText) {
               var reBadWords = /badword|anotherbadword/gi;
               return sText.replace(reBadWords, "****");
           }
           function showText() {
               var oInput1 = document.getElementById("txt1");
               var oInput2 = document.getElementById("txt2");
               oInput2.value = filterText(oInput1.value);
           }
   </script>

</head> <body>

<textarea rows="10" cols="50" id="txt1">badword anotherbadword</textarea>
<input type="button" value="Filter Bad Words" onclick="showText()" />

Filtered Text:
<textarea rows="10" cols="50" id="txt2"></textarea>

</body> </html></source>


Strip HTML

   <source lang="javascript">

<html> <head> <title>Strip HTML Example</title> <script type="text/javascript"> 

   String.prototype.stripHTML = function () {
       var reTag = /<(?:.|\s)*?>/g;
       return this.replace(reTag, "");
   };
   function showText() {
       var oInput1 = document.getElementById("txt1");
       var oInput2 = document.getElementById("txt2");
       oInput2.value = oInput1.value.stripHTML();
   }

</script> </head> <body> <textarea rows="10" cols="50" id="txt1"></textarea>
<input type="button" value="Strip HTML" onclick="showText()" /></p>

Stripped Text:
<textarea rows="10" cols="50" id="txt2"></textarea>

</body> </html></source>


Trim the leading and trailing spaces

   <source lang="javascript">

<html> <head> <title>Trim Example</title> <script type="text/javascript"> 

   String.prototype.trim = function () {
       var reExtraSpace = /^\s+(.*?)\s+$/;
       return this.replace(reExtraSpace, "$1");
   };

   function showText() {
       var oInput1 = document.getElementById("txt1");
       var oInput2 = document.getElementById("txt2");
       oInput2.value = oInput1.value.trim();
   }

</script> </head> <body> <textarea rows="10" cols="50" id="txt1"></textarea>
<input type="button" value="Trim" onclick="showText()" /></p>

Trimmed Text:
<textarea rows="10" cols="50" id="txt2"></textarea>

</body> </html></source>


Use regular expression to remove bad words

   <source lang="javascript">

<html> <head> <title>Bad Words Example</title> <script type="text/javascript"> 

       function filterText(sText) {
           var reBadWords = /badword|anotherbadword/gi;
           return sText.replace(reBadWords, function (sMatch) {
               return sMatch.replace(/./g, "*");
           });
       }
       function showText() {
           var oInput1 = document.getElementById("txt1");
           var oInput2 = document.getElementById("txt2");
           oInput2.value = filterText(oInput1.value);
       }

</script> </head> <body> 

   <textarea rows="10" cols="50" id="txt1">badword anotherbadword</textarea>

   <input type="button" value="Filter Bad Words" onclick="showText()" /></p>

Filtered Text:
<textarea rows="10" cols="50" id="txt2"></textarea>

</body> </html></source>

Источник — «http://wbex.ru/index.php?title=JavaScript_Tutorial/Regular_Expressions/Filter&oldid=9871»