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/^((\d{1,2}|1\d{2}|2[0-4]\d|25[0-5])\.){3}\2(\s|$)
+/

/         (begin pattern match)
^         (match start of scalar)
...
\2        (match '0' to '255')
(\s|$)    (match whitespace or scalar end (when \n absent))
/         (end pattern match)