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Often what you have is carriage return, then line feed.<br />

<pre><code class="code-1 nolinks" id="code-20-39740387-1"><span>\r\n</span>
</code></pre>
<br />
Therefore, make sure the character is indeed a newline versus a carriage return as well as not both.
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btw, when I use <br />

<pre><code class="code-1 nolinks" id="code-20-39740426-1"><span>.split('\n');</span>
</code></pre>
<br />
its work fine...
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I think this is why your previous question showed the optional carriage return ( \r? ). The standard line terminator under Windows is carriage-return/line-feed ( \r\n ). Not everyone follows this, though. Sometimes you have to make either optional in order to match against target data. In your case, I think you are looking for the optional carriage return, so I would modify your example to:<br />
<br />

<pre><code class="code-1 nolinks" id="code-20-39740475-1"><span>.split('\r?\n');</span>
</code></pre>
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In HTML it's &lt;br&gt;; otherwise, try to use vbCrlf instead of the text \n.
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none work,<br />
its not html <br />
@ Rainer Jescho, I have the data in text box
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Can you attach a sample of the text as a file so that we can see what you are working with?
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<a href="http://jsfiddle.net/ethar1/8FBA9" rel="ugc">http://jsfiddle.net/ethar1/8FBA9</a>
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Rainer Jeschor, could you please explain why?
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<div class="content wysiwyg-content">
Dear all ,<br />
I use this <br />

<pre><code class="code-1 nolinks" id="code-10-28325842-1"><span>.split(lineSeperator);</span>
</code></pre>
to split based on passed variable from user input, its work fine , but when user use '\n'<br />
for new line its not working as expected.
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</div>


Dear all ,
I use this 
(CODE)
to split based on passed variable from user input, its work fine , but when user use '\n'
for new line its not working as expected.

var split

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