Substitution of text in keywords

Hello all...

I've been using of Vim as my everyday editor for many years but have
only recently started to program it to do repetitive things for me.

I've written a function to standardise the case of keywords in my code,
however when I run it it's not just the keywords that are being changed
- text within quotes are also being changed e.g. in a message.

Here's a snippet of my function:

" create function to standardise code...
function! StandardiseCode()
:silent! %s,\s\+$,,
:silent! %s,^{,Begin,
:silent! %s,^},End,
:silent! %s,\<activerow\>,ActiveRow,g
:silent! %s,\<and\>,And,g
:silent! %s, \<date\>, Date,g
endfun

I have a syntax file that defines the keywords, comments etc for the
code - is there a way to make the substitution work on just keywords?

Thanks
Dave

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