Regular Expressions 101

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Verbose Python IP4 Address

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Regular Expression
python

"
(?:\s|^) # Start of string or word boundary ( # Capture Group (?: # Non-Capture Group for X. (?: # Nested NCG for 0..255 (?:\d){1,2}| # Allow any single digit or any pair of digits or (?:1\d{2})| # 3 Digits starting with 1 or (?:2[0-4]\d)| # 3 Digists starting with 20..24 or (?:25[0-5]) # 250..255 ) # this should allow X=0..255 in the NCG \. # Must be followed by a literal . ){3} # X. Must repeat exactly 3 times (?: # NCG for final 0..255 (?:\d{1,2})| # Allow any single digit or any pair of digits or (?:1\d{2})| # 3 Digits starting with 1 or (?:2[0-4]\d)| # 3 digits starting 20..24 or (?:25[0-5]) # 250.255 ) # End of final 0.255 ) # End of capture group (?:\s|$) # Must be followed by EOS or wspace
"
gx

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Submitted by Steve (Gadget) Barnes - 5 years ago