[issue7132] Regexp: capturing groups in repetitions

[Philippe Verdy]

Philippe Verdy <verdy_p at wanadoo.fr> added the comment:

In addition, your suggested regexp for IPv4:

'^(\d{1,3})(?:\.(\d{1,3})){3}$'

is completely WRONG ! It will match INVALID IPv4 address formats like 
"000.000.000.000". Reread the RFCs... because "000.000.000.000" is 
CERTAINLY NOT an IPv4 address (if it is found in an URL) but a domain name 
that must be resolved into an IP address using domain name resolution 
requests.

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