Preparation code

      
      <script>

        Benchmark.prototype.setup = function() {

          
  var aString = 'My name is ${name},I\'m ${age}.My name is ${name},I\'m ${age}.My name is ${name},I\'m ${age}.My name is ${name},I\'m ${age}.My name is ${name},I\'m ${age}.My name is ${name},I\'m ${age}.'
  
    function mix(str, group) {
      return str.replace(/\$\{([^{}]+)\}/gm, function(m, n) {
        return (group[n] != undefined) ? group[n] : '';
      });
    }
  
  
    function mix1(str, group) {
      return str.replace(/\$\{[^{}]+\}/gm, function(m, n) {
        n = m.slice(2, -1);
        return (group[n] != void 1) ? group[n] : '';
      })
    }
        
  };


      
</script>
    

Test runner

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mix(aString, {
  name: 'LIX',
  age: 11
})

mix1(aString, {
  name: 'LIX',
  age: 11
})

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