Bind regex match to variable in bash

Question

I've been trying to match a single IPv4 address out of an xml string and bind it to a variable for later use. I've tested the regex itself in some online testers and it appears to function with some sample outputs. I've also tested the BASH_REMATCH similar to the one below with a much simpler regex and pattern and it works. So is there a problem with my regex itself not compatible with bash?

Sample Script...

#!/bin/bash
rawxml="<ip-netmask>1.2.3.4/32</ip-netmask>"
ipv4regex="(((?:|\.)(2(?:5[0-5]|[0-4]\d)|1?\d?\d)){4})"

# Finding IP from $rawxml and binding it to its own variable
if [[ $rawxml =~ $ipv4regex ]]; then
        ipfound=${BASH_REMATCH[1]}
fi

echo "IP found is "$ipfound""

Expected output here would be....

"IP Found is 1.2.3.4"

Gilles Quénot · Accepted Answer · 2019-12-12 05:06:02Z

1

With xmllint and xpath :

xmllint --xpath '//ip-netmask/text()' file.xml

A real XML parser is a better tool than regex to parse XML

edited Dec 12, 2019 at 5:06

answered Dec 12, 2019 at 2:59

Gilles Quénot

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2 Comments

shopkeeper56 Over a year ago

Noted. Will give this a go.

shopkeeper56 Over a year ago

Confirmed this was 1000x easier than trying to use regex. Updating OP with new method

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