Grunt replace last occurrence of matching string

Question

I have a custom requirement where I need to replace the last occurrence of of a closing brace with empty string,

How can i achieve using Grunt-replace ?

In the below Templates.js file I am replacing

    angular.module('abc.templates', []).run(
with 
return

Templates.js

Now I have to remove the unnecessary closing brace at line:20 below.

 angular.module('abc.templates', []).run(['$templateCache', function($templateCache) {
      $templateCache.put("test",
          //
          //
          //
      $templateCache.put("test",
          //
          //
          //
      $templateCache.put("test",
          //
          //
          //
      $templateCache.put("test",
        //
        //
        //
 line 20:   }]);

In the above Templates.js file I want to remove the last occurence of closing brace ')' at line 20 mentioned above.

Can someone help me with any regex or some other way to achieve this ?

Answer 1

Using grunt-replace you could try the following configuration:

Gruntfile.js

module.exports = function (grunt) {

  grunt.initConfig({
    replace: {
      templateJs: {
        options: {
          usePrefix: false,
          patterns: [
            {
              match: /angular\.module\('abc\.templates', \[\]\)\.run\(/g,
              replacement: 'return '
            },
            {
              match: /(angular\.module\('abc\.templates', \[\]\)\.run\([\w\W]+?}])(\))(;)/g,
              replacement: '$1$3'
            }
          ]
        },
        files: [
          // Define your paths as necessary...
          {expand: true, flatten: true, src: ['src/template.js'], dest: 'build/'}
        ]
      }
    }
  });

  grunt.loadNpmTasks('grunt-replace');
  grunt.registerTask('default', 'replace:templateJs');
};

---

Additional info

1. The first match regex pattern used in the patterns Array is explained here . This handles the first part of replacing angular.module('abc.templates', []).run( with return
2. The second match regex pattern used in the patterns Array is explained here . This removes the closing brace ) from }]); to end up with }];

---

Note : The second regex will match the first instance of the characters }]); after the initial angular.module('abc.templates', []).run( part and remove the ) from it. So, unfortunately if the pattern }]); occurs elsewhere in the body of your function this will not meet your requirement. Otherwise it should be ok.