How to use string-replace-webpack-plugin

StringReplacePlugin.replace({
    replacements: [
     {
      pattern: /fs\./g,
      replacement: function () {
       return 'require(\'fs\').';
      }
     }
    ]})

(config.module.loaders || []).concat([{
  test: path.resolve(__dirname, '../src' + projectName + 'assets/common/js/config.js'),
  loader: StringReplacePlugin.replace({
    replacements: [{
      pattern: /127.0.0.1:18805/,
      replacement: function(match, p1, offset) {
        return 'mock-api.seosiwei.com';
      }
    }]
  })
}])

StringReplacePlugin.replace({
    replacements: [
     {
      pattern: 'return this.font(\'Helvetica\');',
      replacement: function () {
       return '';
      }
     }
    ]})

StringReplacePlugin.replace({
    replacements: [
     {
      pattern: 'doc.createElementNS("http://www.w3.org/1999/xhtml", "a")',
      replacement: function () {
       return 'doc ? doc.createElementNS("http://www.w3.org/1999/xhtml", "a") : []';
      }
     }
    ]})

StringReplacePlugin.replace({
     replacements: [
      {
       pattern: 'return this.font(\'Helvetica\');',
       replacement: function () {
        return '';
       }
      }
     ]})

StringReplacePlugin.replace({
     replacements: [
      {
       pattern: /fs\./g,
       replacement: function () {
        return 'require(\'fs\').';
       }
      }
     ]})

StringReplacePlugin.replace({
     replacements: [
      {
       pattern: 'doc.createElementNS("http://www.w3.org/1999/xhtml", "a")',
       replacement: function () {
        return 'doc ? doc.createElementNS("http://www.w3.org/1999/xhtml", "a") : []';
       }
      }
     ]})

(config.module.loaders || []).concat([{
  test: path.resolve(__dirname, '../src' + projectName + 'assets/common/js/config.js'),
  loader: StringReplacePlugin.replace({
    replacements: [{
      pattern: /127.0.0.1:8802/,
      replacement: function(match, p1, offset) {
        return 'mock-api.seosiwei.com';
      }
    }]
  })
}])