Question

I have two buttons on form, one of the buttons contain currency code (EUR, USD, GBP,CHF,..) and another one – trade direction (BUY or SELL). And some utility recognize buttons by it’s text.
To recognize button with currencies, I use Regular expression “:[A-Z]{3}”, but it don’t work properly when second button contain text “BUY” (regex description returns more than one object).

Question: how can I write pattern for Regular expression, which means: match only when text contain three upper letters, but not text “BUY”?

Thanks!

Answer 1

^(?!BUY)[A-Z]{3}$

(?!BUY) is negative lookahead that would fail if it matches the regex BUY