C# 
Regex reg = new Regex( matchExpression );

MatchCollection matches = reg.Matches( value );

if ( matches.Count >= Nth occurrence )

{

    matches[n].Value);

}

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Originally posted as a Categorized Answer.

In reply to Re: How do I find the Nth occurrence of a pattern? by Anonymous Monk
in thread How do I find the Nth occurrence of a pattern? by vroom

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