See discussion at https://en.wikipedia.org/wiki/Wikipedia_talk:AutoWikiBrowser#Finding_unlinked_.22Phi_Beta_Kappa.22

An editor is trying to find articles where the phrase "Phi Beta Kappa" is preceded by a space. These searches at enwiki incorrectly return "1977 in literature". In that article the phrase "Phi Beta Kappa" is preceded by a left square bracket:

Coetzee "Phi Beta Kappa"~0 insource:"/ Phi Beta Kappa/"
Coetzee "Phi Beta Kappa"~0 insource:"/[^\[]Phi Beta Kappa/"
Coetzee "Phi Beta Kappa"~0 insource:"/\\Phi Beta Kappa/"
Coetzee "Phi Beta Kappa"~0 insource:"/@@@ Phi Beta Kappa/"

The insource *is* being processed; the search

Coetzee "Phi Beta Kappa"~0 insource:"/Elephant Phi Beta Kappa/"

correctly returns no results.