CODEWITHSUNDEEP
pythonregex
Luis Henrique
Luis Henrique

Reputation: 771

Regex for IP capture or hostname

I am trying to create a regex for IP capture or hostname, and ignore anything after #

DATA

192.168.0.41 #obs
SRVNET #obs
192.168.0.4 #obs

REGEX

^(([1]?[0-9]{1,2}|2([0-4][0-9]|5[0-5])).){3}([1]?[0-9]{1,2}|2([0-4][0-9]|5[0-5]|[a-z]))$

Upvotes: 0

Views: 42

Answers (1)

The fourth bird
The fourth bird

Reputation: 163207

In the first part of the pattern from the comments you are matching [^#]+ which is a negated character class and will also match a space.

As you don't want to match spaces, you could add \s to it to not match whitespace characters.

The whole match is wrapped in group 1, but as that is the only match you might make it non capturing (?:

Note that you have to escape the dot to match it literally and that [1] is the same as just 1.

^(?:[^#\s]+)|^((1?[0-9]{1,2}|2([0-4][0-9]|5[0-5]))\.){3}(1?[0-9]{1,2}|2([0-4][0-9]|5[0-5]))$
       ^^       ^^                                ^^

Regex demo

Upvotes: 1

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