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"\b" matches a word boundary, which is the position between a word character and a non-word character, or at the start/end of the string.

"\B" matches any position that is not a word boundary.

So in expression "\Bσ\b", the letter "σ" must be preceded by a word character and followed by a non-word character or the end of string.

Reference: https://www.den4b.com/wiki/ReNamer:Regu … boundaries