Perform a search for alternative words

[jungkim]

I'm using a 2003 Word and have a huge word document in which to search for any one of the words 'has' 'have' 'had' 'having'. What I came across is this: http://office.microsoft.com/en-us/wo...102350661.aspx
After struggling with the so-called regular expressions, I finally figured out the following: <(ha[v|s|d]*)>
Input in the Find What field, this regular expression found me any one of the above-mentioned words.



Now here come my two questions:
First, is there an easier or more intuitive way to perform the aforementioned search in Word 2003?
Second, using the regular expressions, I now would like to search for any one of the phrases: 'have to' 'has to' 'had to' 'having to'. But when I typed in the Find What field the following, Word didn't just return 'have to' but also phrases like 'have something to': <(ha[v|s|d]*)> <(to)>. Any suggestion to fix this expression will be appreciated.

Thanks in advance!
Regards,
Jung