What is a “Nested Quantifier” and why is it causing my regex to fail?

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.NET is complaining about the + after the {n} style quantifier as it doesn’t make any sense. {n} means match exactly n of a given group. + means match one or more of a given group. Remove the +‘s and it’ll compile fine.

"_ [ 0-9]{10} {1}[ 0-9]{10} {2}[ 0-9]{6} {2}[ 0-9]{2}"

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