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Regex whitespace word boundary

I have this expression

[A-Za-z]+

If I give abc@de mnop, it matches abc, de and mnop, but I want it to match only mnop. How can I do that?

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is a word boundary.

So, is similar to [^a-zA-Z0-9_] i.e would check for anything except word

You can instead use this regex

(?<=s|^)[a-zA-Z]+(?=s|$)
-------- --------- ------
   |         |       |->match only if the pattern is followed by a space(s) or end of string/line($)
   |         |->pattern
   |->match only if the pattern is preceded by space(s) or start of stringline(^)

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