Hi
There is no line that begins with 'barney'
There is a line that begins with ' barney'
https://metacpan.org/pod/re#%27debug%27-mode explains
$ perl -Mre=debug barney
Compiling REx "^barney"
Final program:
1: MBOL (2)
2: EXACT <barney> (5)
5: END (0)
anchored "barney" at 0 (checking anchored) anchored(MBOL) minlen 6
Guessing start of match in sv for REx "^barney" against "This is a wil
+ma line%n barney is on this line%n "..
.
Found anchored substr "barney" at offset 30...
Found /^/m, restarting lookup for check-string at offset 53...
Did not find anchored substr "barney"...
Match rejected by optimizer
Barney not found
Freeing REx: "^barney"
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