The conditional, "if you were to break up your regex to find a series of partial matches," was not an accident either.

Were OP to use postmatch to find the last partial that succeeded, he would have at least an initial indication of where the failure occured.

In reply to Re^3: How to find where regex did not match across the line (postmatch) by ww
in thread How to find where regex did not match across the line by Anonymous Monk

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