Regex to find attribute in xml tag and replace its value (node/Javascript)

Question

I have a Cordova config.xml file and I'm writing a script to bump up the version. A sample of the file is:

<?xml version="1.0" encoding="utf-8"?>
<widget android-packageName="com.demo.android" id="com.demo.ios" ios-CFBundleIdentifier="com.demo.ios.dev" version="1.16.6" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">
    <name short="DEMO DEV">DEMO</name>

I want to replace the value of the attribute version that is inside the <widget> tag, but without affecting at all any other attribute, including the one in the <?xml tag.

So, simply put, find and replace the value of the attribute version inside the widget tag.

Use this regex to look for the version number (?<=\<widget.*(?<=version\=\"))(\d+\.?)+ and then replace the string with suitable replacement. — Amit Bhardwaj
– Amit Bhardwaj, Commented Oct 16, 2018 at 19:09
Is there only one widget tag. If not, can it possibly not have a version ? Because the whole <widget.*?version= thing just won't cut it. That's why I posted a hairy regex, to avoid such trivia, and is the only way it can be done. — user557597
– user557597, Commented Oct 19, 2018 at 20:16

lumio · Accepted Answer · 2018-10-19 20:32:08Z

5

You can try the following regex and test it on regex101:

/(<widget [\S\s]*?version=")[^"]+("[\S\s]*?>)/gmi

In short, what am I doing:

Group everything from <widget to version="
Select everything except a "
Group everything until the next >.

You can then replace it with $1(new version)$2.

Here is a simple demo:

const versionRegex = /(<widget [\S\s]*?version=")[^"]+("[\S\s]*?>)/gmi;

const content = `<?xml version="1.0" encoding="utf-8"?>
<widget android-packageName="com.demo.android" id="com.demo.ios" ios-CFBundleIdentifier="com.demo.ios.dev" version="1.16.6" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">
    <name short="DEMO DEV">DEMO</name>`

const newVersion = 'testVersion';
const replaced = content.replace( versionRegex, `$1${ newVersion }$2` )
document.getElementById( 'result' ).innerText = replaced;

pre {
  white-space: pre-line;
}

<pre id="result"></pre>

edited Oct 19, 2018 at 20:32

answered Oct 16, 2018 at 19:23

lumio

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1 Comment

user557597 Over a year ago

Doesn't span lines: regex101.com/r/e7oNcP/3. Even if you fix that, doesn't parse the widget tag correctly: regex101.com/r/e7oNcP/4

Zagonine · Accepted Answer · 2018-10-16 20:16:25Z

3

This do what you want:

let xml; // Your xml file
const version = "0.8.5"
xml = xml.replace(/(<widget.+version=")([0-9\.]+)(".*>)/, "$1"+version+"$3")

Explanation of regex matches:

First match of the regex ($1): first string which begin with <widget with all chars until version="
The second match ($2, not in the replace cause this is the string we want to replace) is the version number
The last match is all chars until caret closing > of the widget attribute.
And the global match is this three matches together

edited Oct 16, 2018 at 20:16

answered Oct 16, 2018 at 19:58

Zagonine

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score 0 · Accepted Answer · 2018-10-16 19:38:18Z

Try

Find /<widget(?=\s)(?=((?:[^>"']|"[^"]*"|'[^']*')*?\sversion\s*=\s*)(?:(['"])([\S\s]*?)\2)((?:"[\S\s]*?"|'[\S\s]*?'|[^>]*?)*?>))\s+(?:"[\S\s]*?"|'[\S\s]*?'|[^>]*?)+>/

Replace <widget$1$2NEW_VERSION$2$4

https://regex101.com/r/1KnW0M/1

(The old version is in Capture Group 3 incase it's needed.)

More info

 # Begin Widget tag

 < widget                 
 (?= \s )
 (?=                           # Asserttion (a pseudo atomic group)
      (                             # (1 start), Up to Version attribute
           (?: [^>"'] | " [^"]* " | ' [^']* ' )*?
           \s version \s* = \s* 
      )                             # (1 end)
      (?:
           ( ['"] )                      # (2), Quote
           ( [\S\s]*? )                  # (3), Version Value
           \2 
      )
      (                             # (4 start), After Version attribute
           (?: " [\S\s]*? " | ' [\S\s]*? ' | [^>]*? )*?
           >
      )                             # (4 end)
 )

 # Have the version, just match the rest of tag

 \s+ 
 (?: " [\S\s]*? " | ' [\S\s]*? ' | [^>]*? )+

 >                             # End Widget tag

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