&lt;br&gt;&lt;h1&gt;First&lt;/h1&gt;Blah Blah&lt;br&gt;Testing&lt;br&gt;&lt;h2&gt;Second&lt;/h2&gt;

&lt;h1&gt;First&lt;/h1&gt;
Start pos: 4
End pos: 18
Length: 14

&lt;h2&gt;Second&lt;/h2&gt;
Start pos: 42
End pos: 57
Length: 15