I want to extract a string whether it is at the beginning of a sentence or the end it has to be the whole word. The expression should work in both PCRE and POSIX.
Example:
input strings=['ALLY [&] MORTY','[&] ME', '[&]']
---> match is in bracket
POSIX and PCRE compliant regex to extract a word
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(^| )matches either the beginning of the string or a space(&)matches the literal string&.( |$)matches either a space or the end of the string.The match will be in capture group 1.