[RESOLVED] [RegEx for AS3] RegExp Code Keywords?

I wrote a script that acts as a syntax highlighter highlighting keywords a certain colour. My issue is that the RegExp expression I am currently using is flawed:

Code:

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this|var|int|String|Object|is|in

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The issue with the script is that words within words will be highlighted for example using the above expression following will occur:

var whatis:int = 0;

int is highlighted correctly however I do not want is to be highlighted. How do I make it so the above list is found with the following conditions:

It can not be part of other letters/numbers/symbols
The only symbols/characters that it can be beside are:

. : ? ( ) { } ! + - * / % ^

Basically it's a list of exceptions to what can be next to the keyword, on either side of it. How do I implement this? - What is the expression?

Something like...

Code:

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\b (this|var|int|String|Object|is|in) (?!\w)

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\b specifies to match a word boundary, and the (?!\w) specifies that what you matched should not be followed by another word character.

Thanks :check: