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RegEx to shrink text with HTML tags

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Last Modified: 2012-08-13
I hav a string that contains a lot different HTML tags. I want to shorten it to, let's say, maximum 400 characters. The issue I have is:
I need to make shure that I don't leave open HTML tags. So let's say the text ends with
---
<a href=".....">whatever</a>
---
 and the cap would be in the middle of the word "whatever", then I can't have
---
<a href=".....">whatev...
---
at the end of the string.

So I need a regular expression that does the following:
1) find end of words where I want to do the cut.
2) If an HTML tag would stay open there, then do the cut BEFORE the last HTML tag.

Can anybody help?
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