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  • Is there always a space on each side of the IP addresses in your search? Commented Mar 20, 2017 at 2:30
  • Is that supposed to be a single line? Do you want to replace all IP addresses preceding "SpecialWord", or only the first, or only the last? Commented Mar 20, 2017 at 10:15
  • 1
    In your example, 32.123.21.44 is not followed by "SpecialWord", and therefore should be changed, but you left it untouched. On the other hand, 255.43.23.8 is followed by "SpecialWord", albeit not directly, and you changed it. Should "follow" be understood as "directly follow"? Commented Mar 20, 2017 at 10:59
  • This issue can not be solved reliably if the text surrounding the IP address is random, i.e. if it's allowed to contain IP addresses. Commented Sep 24, 2017 at 19:04