CODEWITHSUNDEEP
regexxmlbashsedxml-namespaces
DanielRead
DanielRead

Reputation: 2794

sed regex expression replace

I have a config.xml file that has this line in it:

<widget id="com.FitDegree.SOMETHING" version="5.1.0" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">

Using a bash script, I need to replace com.FitDegree.SOMETHING with a string such as com.FitDegree.ThisIsIt

The closest I can get is this: 

  sed -r 's/\"com\.FitDegree\..+?\"/"com.FitDegree.ThisIsIt"/' ../config.xml > tmpfile
  mv tmpfile ../config.xml

but it results in: 

<widget id="com.FitDegree.ThisIsIt">

Note: it got rid of all the other things in that line such as version, xmlns etc.

When I test it on a regex tester: https://regex101.com/r/nI8xB8/1 it only selects the com.FitDegree.SOMETHING

Any clue how to fix this?

Upvotes: 1

Views: 1270

Answers (3)

user unknown
user unknown

Reputation: 36229

This is a risky regex, but often you know, whether the risk is real or only a thinkable one, since the dot matches dots too:

sed 's,com.FitDegree.SOMETHING,com.FitDegree.OtherThing,' sample-2.xml

Your .+\" is greedy and takes the last " as delimiter it can. To make it work, you could define a non matching group for everything, except quotes:

sed -r 's/\"com\.FitDegree\.[^"]+?"/"com.FitDegree.ThisIsIt"/'
#                           ^^^^  ^no masking needed

Upvotes: 0

CharlieH
CharlieH

Reputation: 1542

I would use a sed character class, with a backreference for simplicity:

sed -e 's/\(\"com\.FitDegree\.\)[^"]*/\1ThisIsIt/' ../config.xml

If you have the option available, you can edit the file in place:

sed -i -e 's/\(\"com\.FitDegree\.\)[^"]*/\1ThisIsIt/' ../config.xml

BTW, Perl handles regular expressions considerably more easily, and this would be:

perl -pe 's/("com\.FitDegree\.).*?"/\1ThisIsIt"/' ../config.xml

And to edit in place:

perl -i -pe 's/("com\.FitDegree\.).*?"/\1ThisIsIt"/' ../config.xml

Upvotes: 0

RomanPerekhrest
RomanPerekhrest

Reputation: 92854

The right way with xmlstarlet tool:

xmlstarlet ed -N ns="http://www.w3.org/ns/widgets" \
-u '//ns:widget/@id' -v 'com.FitDegree.ThisIsIt' config.xml

Upvotes: 2

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