old_contents: /*
  Language: DOS .bat
  Author: Alexander Makarov <sam@rmcreative.ru>
  Contributors: Anton Kochkov <anton.kochkov@gmail.com>
  */
  
  function(hljs) {
    var COMMENT = {
      className: 'comment',
      begin: /@?rem\b/, end: /$/,
  	  relevance: 10
    };
    var LABEL = {
  	  className: 'label',
  	  begin: '^\\s*[A-Za-z._?][A-Za-z0-9_$#@~.?]*(:|\\s+label)',
  	  relevance: 0
    };
    return {
      aliases: ['bat', 'cmd'],
      case_insensitive: true,
      keywords: {
        flow: 'if else goto for in do call exit not exist errorlevel defined',
        operator: 'equ neq lss leq gtr geq',
        keyword: 'shift cd dir echo setlocal endlocal set pause copy',
        stream: 'prn nul lpt3 lpt2 lpt1 con com4 com3 com2 com1 aux',
        winutils: 'ping net ipconfig taskkill xcopy ren del',
        built_in: 'append assoc at attrib break cacls cd chcp chdir chkdsk|10 chkntfs cls cmd color ' +
          'comp compact convert date dir diskcomp diskcopy|10 doskey erase fs ' +
          'find findstr|10 format ftype graftabl help keyb label md mkdir mode more move path ' +
          'pause print popd pushd promt rd recover rem rename replace restore rmdir shift' +
          'sort start subst time title tree type ver verify vol',
      },
      contains: [
        {
          className: 'envvar', begin: '%%[^ ]'
        },
        {
          className: 'envvar', begin: '%[^ ]+?%'
        },
        {
          className: 'envvar', begin: '![^ ]+?!'
        },
        {
          className: 'function',
          begin: LABEL.begin, end: 'goto:eof',
          contains: [
            hljs.inherit(hljs.TITLE_MODE, {begin: '([_a-zA-Z]\\w*\\.)*([_a-zA-Z]\\w*:)?[_a-zA-Z]\\w*'}),
            COMMENT
          ],
          relevance: 10
        },
        {
          className: 'number', begin: '\\b\\d+',
          relevance: 0
        },
        COMMENT
      ]
    };
  }
  
new_contents: /*
  Language: DOS .bat
  Author: Alexander Makarov <sam@rmcreative.ru>
  Contributors: Anton Kochkov <anton.kochkov@gmail.com>
  */
  
  function(hljs) {
    var COMMENT = {
      className: 'comment',
      begin: /@?rem\b/, end: /$/,
  	  relevance: 10
    };
    var LABEL = {
  	  className: 'label',
  	  begin: '^\\s*[A-Za-z._?][A-Za-z0-9_$#@~.?]*(:|\\s+label)',
  	  relevance: 0
    };
    return {
      aliases: ['bat', 'cmd'],
      case_insensitive: true,
      keywords: {
        flow: 'if else goto for in do call exit not exist errorlevel defined',
        operator: 'equ neq lss leq gtr geq',
        keyword: 'shift cd dir echo setlocal endlocal set pause copy',
        stream: 'prn nul lpt3 lpt2 lpt1 con com4 com3 com2 com1 aux',
        winutils: 'ping net ipconfig taskkill xcopy ren del',
        built_in: 'append assoc at attrib break cacls cd chcp chdir chkdsk chkntfs cls cmd color ' +
          'comp compact convert date dir diskcomp diskcopy doskey erase fs ' +
          'find findstr format ftype graftabl help keyb label md mkdir mode more move path ' +
          'pause print popd pushd promt rd recover rem rename replace restore rmdir shift' +
          'sort start subst time title tree type ver verify vol',
      },
      contains: [
        {
          className: 'envvar', begin: '%%[^ ]'
        },
        {
          className: 'envvar', begin: '%[^ ]+?%'
        },
        {
          className: 'envvar', begin: '![^ ]+?!'
        },
        {
          className: 'function',
          begin: LABEL.begin, end: 'goto:eof',
          contains: [
            hljs.inherit(hljs.TITLE_MODE, {begin: '([_a-zA-Z]\\w*\\.)*([_a-zA-Z]\\w*:)?[_a-zA-Z]\\w*'}),
            COMMENT
          ]
        },
        {
          className: 'number', begin: '\\b\\d+',
          relevance: 0
        },
        COMMENT
      ]
    };
  }
  
subject: Reset keyword relevance in DOS.