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input 12345
output gsub(/regex/,"x",input)
regex output
(^) x12345
($) 12345x
(^)|($) x12345x
($)|(^) x12345x
(2) 1x345
(^)|2 x1x345
2|(^) x1x345
($)|2 1x345x
2|($) 1x345x
(2)|(^) x1x345
(^)|(2) x1x345
(2)|($) 1x345x
($)|(2) 1x345x
.((2)|(^)) x345
.((^)|(2)) x345
.((2)|($)) x34x
.(($)|(2)) x34x
x*((2)|(^)) x1x345
x*((^)|(2)) x1x345
x*((2)|($)) 1x345x
x*(($)|(2)) 1x345x
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