I think the problem is more complicated than you think. As BrowserUk points out - the OP has indicated 'BBC49' and 'BBC50' is a match. Even if you corrected for that, I think your first discriminating factor would be wrong. Consider ABC99 and ABC100.
Cheers - L~R
In reply to Re^2: searching for strings
by Limbic~Region
in thread searching for strings
by steph_bow
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