Regex match question

<h2>{title}</h2>
<p><a href="{url}">{content}</a></p>

['title', 'url', 'content']

var pattern = new RegExp("{[a-zA-Z]+}+");
var match = pattern.exec("{Sample} bob {text}");

var pattern = new RegExp("{[a-zA-Z]+}", "g");

var pattern = /{[a-zA-Z]+}/g;

var matches = "{Sample} bob {text}".match(pattern);

var pattern = new RegExp("{[a-zA-Z]+}+", "g");

<script>
var text = '<h2>{title}</h2>n<p><a href="{url}">{content}</a></p>';
var regex = /{[a-z]+}/ig;
var result = text.match(regex);
for (var i = 0; i < result.length; i++) {
    console.debug(i + ". " + result[i]);
}
/*
gives:
0. {title}
1. {test}
2. {url}
3. {content}
*/
</script>

String.prototype.template = function (obj) {
 return this.replace(/{([^{}]+)}/g,
  function (full, word) {
   return((typeof obj[word]==='string'||typeof obj[word]==='number')?obj[word]:full);
  }
 );
};

"The {adj1} {adj2} {noun}.".template({adj1: 'lazy',adj2: 'brown', noun: 'dog'})
==> "The lazy brown dog."