see =~ in perlop

=~ with a string implies regex m//atch 

$ perl -Mre=debug -e " $_=q{shabba}; $_ =~ q{shabba}
Compiling REx "shabba"
Final program:
   1: EXACT <shabba> (4)
   4: END (0)
anchored "shabba" at 0 (checking anchored isall) minlen 6
Guessing start of match in sv for REx "shabba" against "shabba"
Found anchored substr "shabba" at offset 0...
Guessed: match at offset 0
Freeing REx: "shabba"

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In reply to Re: Misreading m// documentation (perlop =~ ) by Anonymous Monk
in thread Misreading m// documentation by QM

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