75.122.1.23
I need to replace the third number with 2 so it looks like 75.122.2.23
What regex can match the third section?
int replacementNumber = 2;
ip = ip.replaceAll("(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})", "$1.$2."+replacementNumber+".$4");
Commented form:
/^ # match beginning
(
\d{1,3} # one address segment
\. # separation dot
\d{1,3}) # second address segment
\. # separation dot
\d{1,3} # address segment to be replaced
\. # separation dot
(\d{1,3}) # last address segment
$/x # match end, ignore comments
^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.
([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])$
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