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/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/
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//Regex IPv4
^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$
//Regex IPv6 https://regex101.com/r/rB9pG1/1
^([[:xdigit:]]{1,4}(?::[[:xdigit:]]{1,4}){7}|::|:(?::[[:xdigit:]]{1,4}){1,6}|[[:xdigit:]]{1,4}:(?::[[:xdigit:]]{1,4}){1,5}|(?:[[:xdigit:]]{1,4}:){2}(?::[[:xdigit:]]{1,4}){1,4}|(?:[[:xdigit:]]{1,4}:){3}(?::[[:xdigit:]]{1,4}){1,3}|(?:[[:xdigit:]]{1,4}:){4}(?::[[:xdigit:]]{1,4}){1,2}|(?:[[:xdigit:]]{1,4}:){5}:[[:xdigit:]]{1,4}|(?:[[:xdigit:]]{1,4}:){1,6}:)$
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^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$
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^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$
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rgx = re.compile(r"^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)(\.(?!$)|$)){4}$")
regex = '((?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.){3}(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))) - -'
ip = re.findall(r""+regex+"",mySTRING) # works
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((?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.){3}(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))
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Best for Now (43 chars)
^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$
This version shortens things by another 6 characters while
not making use of the negative lookahead, which is not
supported in some regex flavors.
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// Method 2: Restarting the taskbar using taskkill command in command prompt
Press Windows key + r
Enter 'cmd'
Run this command 'taskkill /f /im explorer.exe && start explorer.exe'