Using Regex to search strings......

Hey guys,
I'm trying to scan an html file for specific strings. Basically, I just store the entire html file as a one big long string and then use a regex to scan the string for specific keywords that I am looking for. However, I am not all that familiar with regular expressions in java, and, although I have spent a considerable amount of time reading over the tutorials, I can't seem to get my regular expression to produce the results that I want.
+More specifically, what I am trying to scan the html string for is a keyword preceded by a non-alphanumeric character([/W] and followed by a non-alphanumeric character. Also, since the keywords generally represent country names, state names, state abbreviations, city names, and the like.....I really want to make the scan case-insensitive to the case format of the keyword except in the case that the keyword is an abbreviation (i.e., CA, IN, NY,etc. since making this case-insensitive would pick up a lot of garbage, especially in cases like: IN)+_.* As of right now, this is what I am using for my regex(and the results are all over the place):
*String regex = "[/W]+"+"(?i)"+keyword+"[/W]+";*
This just seems wrong! I've played around with it and, lets just say, the results have generally gotten worse. Does anyone have any ideas on how I should correctly format the regex to achieve the goal explained above?? Any and all help would be greatly appreciated. Thanks.

A technique I find very useful in writing complex regex's is to split the regex into its parts and work on just the one part at a time. This helps me to easily see that the components match exactly what I think I am matching. Once I have every individual part working it is very easy to join them to create the entire match.
Something like...
String keywordRegex = "";
String nonAlphaCharRegex = "";
//..etc. etc
String fullRegex = keywordRegex + "whateverIwantToMatchBetween" + nonAlphaCharRegex + ...

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