Methods for replacing HTML element attributes with regular expressions _javascript tips

A regular expression replaces any attribute of any HTML element, or increases any property.

/**
 * Replaces any attr value in any tag within HTML
 * @param src_str
 * @param tag
 * @param attr
 * @param val
 * @returns {* }
 *
/replace_html_tag_attr:function (SRC_STR, Tag, attr, Val) {
  if (typeof src_str = = ' undefined ' | | typeof t AG = = ' undefined ' | | typeof attr = = ' undefined ' | | typeof val = = ' undefined ') {return
    ';
  }

  var reg = new RegExp (' < ' + tag + ' [^>]* (' + attr + ' =[\ ' \ "] (\\w*%?) [\'\"])? [^>]*> ', ' gi ');
  Return Src_str.replace (Reg, function (match) {
    if (Match.indexof (attr) > 0) {
      //contains attr attribute, replace attr
      var Sub_reg = new RegExp (attr + ' =[\ ' \ "] (\\w*%?) [\ '] ', ' gi ');
      Return Match.replace (Sub_reg, attr + ' = ' + val);
    } else{
      //does not contain attr attribute, add attr return
      match.substr (0, Tag.length + 1) + ' + attr + ' = ' + val + ' + match.substr (ta G.length + 2, match.length);}}

Above this regular expression replaces the HTML element attribute the method is small series to share to everybody's content, hoped can give everybody a reference, also hoped that everybody supports the cloud habitat community.