Regex whitespace word boundary

by

\b is a word boundary.

So, \b is similar to [^a-zA-Z0-9_] i.e \b 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 string\line(^)

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