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               <div id="css-table">
  <div id="col-1">
   <ul>
    <li><a href="#col-1-tab-1">Example 1</a></li>
   </ul>
   <div id="col-1-tab-1">
   <article>
    <h1>email address</h1>
    <p class="title">
     <b>RegExp:</b>
       </p>
    <textarea class="input" id="regexp-def" disabled></textarea>
    </p>
    <p>
     <p class="title"><b>apg-exp:</b>
    </p>
    <textarea class="input" id="apgexp-def" disabled></textarea>
    </p>
      <p class="title"><b>email address:</b>
    </p>
     <textarea class="input" id="email-address"></textarea>
    </p>
    <p>
     <button id="tryit" class="tryit">try it</button>
    </p>
   </div>
   </article>
  </div>
  <div id="col-2">
   <ul>
    <li><a href="#col-2-tab-1">apg-exp</a></li>
   </ul>
   <div id="col-2-tab-1">
   <article>
    <p>
     All phrases captured by all rules are retained along with the index to the first letter where the capture was found. Display of the character
     rules,
     <code>local-char, sub-domain-char, top-domain-char, alpha, num & special</code>
     has been suppressed for clarity. Note that the first rule in the syntax always defines the full phrase to be matched.
     <code>result[0]</code>
     is simply an alias for compatibility with RegExp.
    </p>
    <div id="pattern-note">
    <p>
    <i><b>Note:</b> First-time users
    are often unclear about how, exactly, that big, multi-line ABNF pattern syntax is introduced into the <b>apg-exp</b> object.
    The short answer is, exactly the same way that a regular expression is introduced into the RegExp object.
    It is passed into the constructor as a single string.
    </p>
    <pre>
var exp = new ApgExp(pattern);
</pre>
    The only difference between this and constructing a RegExp object is that the pattern is a multi-line string.
    The ABNF named rules must be on separate lines and end with a newline (continuation lines begin with a space or tab).
    <ul>
    <li>
    In a web application, the pattern is often read from a textarea, as is done in this example (see the function <code>executeApgExp()</code>).
    </li>
    <li>
    In a desktop setting, the pattern is often read from a multi-line text file.
    </li>
    <li>
    For simple patterns or quick testing they might simply be introduced as a constructed string:
    <pre>
var pattern = "";
pattern += 'email-address = %^ local "@" domain %$\n';
pattern += 'local = local-word *("." local-word)\n';
  ...
</pre>
    </li>
    </ul></i>
    </div>
    <div id="apgexp-result"></div>
   </div>
   </article>
  </div>
  <div id="col-3">
   <ul>
    <li><a href="#col-3-tab-1">RegExp</a></li>
   </ul>
   <div id="col-3-tab-1">
   <article>
    <p>
     This syntax is taken from the <a class="link" href="http://www.amazon.com/Regular-Expressions-Cookbook-Jan-Goyvaerts/dp/1449319432">
      <i>Regular Expressions Cookbook</i>
     </a> by Goyvaerts and Levithan, pg. 245. Some groupings have been added to capture the local and domain parts (
     <code>result[1]</code> & <code>result[4]</code>, respectively) and the local, sub-domain and top-domain words.
     In the case where a single group captures more than one phrase, only the last capture is retained.
     This can be seen in this example with the "local word" and "sub domain" groups,
     <code>result[3]</code> & <code>result[5]</code>, respectively.
     </p>
     <p>
     Note that many
     <a class="link" href="http://www.regular-expressions.info/tools.html">other languages</a> offer more features
     and even with RegExp there are <a class="link" href="http://xregexp.com/">good tools</a> for easier use, more features and <a
      class="link" href="https://www.regexbuddy.com/">debugging help</a>.
      But with native JavaScript RegExp, this is about all you get.
    </p>
    <div id="regexp-result"></div>
   </article>
   </div>
  </div>
 </div>

            
          
!
            
              /* Pen-specific styles */
* {
  box-sizing: border-box;
}

body {
  color: #000;
  font-size: .8rem;
  line-height: 150%;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.75rem 0;
  font-family: 'Open Sans', sans-serif;
  font-weight: 700;
}

h2 {
  font-family: 'Open Sans', sans-serif;
  font-weight: 700;
}

article {
  font-family: 'Open Sans', sans-serif;
  font-weight: 400;
}

b {
  font-family: 'Open Sans', sans-serif;
  font-weight: 700;
}

i {
  font-family: 'Open Sans', sans-serif;
  font-style: italic;
}

textarea {
  width: 100%;
}

button {
  cursor: pointer;
  cursor: hand;
}

p.title {
  margin: 0px 0px 3px 0px;
}

a.link {
  color: #4284B0;
}

a.link:visited {
  color: #9c4be7;
}

/* Pattern styles */
#css-table {
	display: table;
}

#col-1 {
	display: table-cell;
	width: 30%;
	border: 1px solid #4284B0;
}

#col-2 {
	display: table-cell;
	width: 35%;
	border-width: 1px 0px;
	border-style: solid;
	border-color: #4284B0;
}

#col-3 {
	display: table-cell;
	width: 35%;
	border: 1px solid #4284B0;
}

textarea.input {
	font-size: .9rem;
	font-family: monospace;
}

pre{
  font-size: .9rem;
  font-family: monospace;
  line-height: 100%;
}

#regexp-def, #apgexp-def, #email-address {
	width: 95%;
}

#regexp-def {
	height: 5em;
}

#apgexp-def {
	height: 20em;
}

.tryit {
	font-size: 1em;
	width: 5rem;
	cursor: pointer;
	cursor: hand;
}

.discussion {
	display: inline;
	font-size: .9rem;
	line-height: 125%;
}

.title {
	margin: .25rem 0;
}

div#pattern-note{
	font-size: .9em;
	line-height: 1.1em;
}
            
          
!
            
              //main function
var execute = function() {
  executeApgExp();
  executeRegExp();
}

// execute apg-exp
var executeApgExp = function(){
  var exp, result, output;
  exp = new ApgExp($("#apgexp-def").val());
  exp.exclude([ "local-char", "sub-domain-char", "top-domain-char", "alpha", "num", "special" ]);
  result = exp.exec($("#email-address").val());
  if (result) {
    output = result.toHtml();
  } else {
    output = "<pre>\n";
    output += "result: null";
    output += "</pre>\n";
  }
  $("#apgexp-result").html(output);
}

//execute RegExp
var executeRegExp = function(){
  var exp, result, output;
  exp = new RegExp($("#regexp-def").val(), "i");
  result = exp.exec($("#email-address").val());
  if (result) {
    output = regToHtml(result);
  } else {
    output = "<pre>\n";
    output += "result: null";
    output += "</pre>\n";
  }
  $("#regexp-result").html(output);
}

// format RegExp result to HTML table
var regToHtml = function(result) {
  var html = "";
  var caption = "result:";
  html += '<table class="apg-left-table">\n';
  html += '<caption>' + caption + '</caption>\n';
  html += '<tr>';
  html += '<td>input</td>';
  html += '<td>' + result.input + '</td>';
  html += '</tr>\n';

  html += '<tr>';
  html += '<td>index</td>';
  html += '<td>' + result.index + '</td>';
  html += '</tr>\n';

  for (var i = 0; i < result.length; i += 1) {
    html += '<tr>';
    html += '<td>[' + i + ']</td>';
    html += '<td>' + result[i] + '</td>';
    html += '</tr>\n';
  }
  html += '</table>\n';
  return html;
}

$(document).ready(function() {
  var string = {};
  
  // RegExp - regular expression syntax
  string.regexp = "^(([\\w!#$%&'*+/=?^_`{|}~-]+)(?:\\.([\\w!#$%&'*+/=?^_`{|}~-]+))*)@((?:([A-Z0-9-]+)\\.)+([A-Z]{2,6}))$";

  // ApgExp - ABNF syntax
  string.apgexp = "";
  string.apgexp += 'email-address   = %^ local "@" domain %$\n';
  string.apgexp += 'local           = local-word *("." local-word)\n';
  string.apgexp += 'domain          = 1*(sub-domain ".") top-domain\n';
  string.apgexp += 'local-word      = 1*local-char\n';
  string.apgexp += 'sub-domain      = 1*sub-domain-char\n';
  string.apgexp += 'top-domain      = 2*6top-domain-char\n';
  string.apgexp += 'local-char      = alpha / num / special\n';
  string.apgexp += 'sub-domain-char = alpha / num / "-"\n';
  string.apgexp += 'top-domain-char = alpha\n';
  string.apgexp += 'alpha           = %d65-90 / %d97-122\n';
  string.apgexp += 'num             = %d48-57\n';
  string.apgexp += 'special         = %d33      / %d35 / %d36-39\n';
  string.apgexp += '                  / %d42-43 / %d45 / %d47\n';
  string.apgexp += '                  / %d61    / %d63 / %d94-96\n';
  string.apgexp += '                  / %d123-126\n';

  // initial email address
  string.input= 'foo.b.bar@my.email.com';

  // page setup
  $("#col-1").tabs();
  $("#col-2").tabs();
  $("#col-3").tabs();
  $("#regexp-def").val(string.regexp)
  $("#apgexp-def").val(string.apgexp)
  $("#email-address").val(string.input)
  $("#tryit").click(execute);
});

            
          
!
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