a non-match does not return 0. It returns the empty string
Strictly speaking, it returns PL_sv_no, which has both a numerical value of 0 and a string value of "":
$ perl5140 -MDevel::Peek -e 'Dump scalar(/x/)'
SV = PVNV(0x275ee10) at 0xa26500
REFCNT = 2147483647
FLAGS = (IOK,NOK,POK,READONLY,pIOK,pNOK,pPOK)
IV = 0
NV = 0
PV = 0x275ee00 ""\0
CUR = 0
LEN = 16
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