I am looking to identify all strings that begin with an @ symbol, unless they also contain other characters before the @. For instance, in @one @two and bla@three, I want to identify @one and @two, but not @three. This is for highlighting usernames in a chatroom.
These strings may appear anywhere within a sentence, whether at the beginning or in the middle.
I initially believed that (?![a-zA-Z])@[a-zA-Z]+ would suffice, but it still recognizes @three as well.
A regex look around is not necessary; a straightforward regex like this will suffice:
\B@\w+
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