Preparation code

<div id="test">
   <div class="child-1"></div>
   <div class="child-2"></div>
   <div class="child-3"></div>
   <div class="child-4"></div>
   <div class="child-5"></div>
</div>

Preparation code output

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document.getElementsByClassName('test-3')[0];

var children = document.getElementById('test'),
    i = 0, 
    len = children.length,
    c_i;

for (; i < len;  i += 1) {
    c_i = children[i];
    if (/test\-3/.test(c_i)) return c_i;
}

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