Question

Hello i have a class with elements

<div class="help_1"></div>
<div class="onemoreclass help_2 twoclass"></div>
<div class="test help_3"></div>
<div class="class1 help_4"></div>

how can i extract only help_(*) matches with javascript?

Answer 1

for straight javascript working against the attribute class (assuming you’re not using jQuery and can locate the elements in question via DOM)

// Contains array of matches or null if none found
var matches= classAttr.match(/(help_\w)/g);