And if you tighten the regex to this? 

m[(?smx: Security \s+ Code \s+ Matched \s* </th> \s* <td> \s*  N/A)];

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The only concern I see here is the possibility of the <td> having attributes?

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In reply to Re^3: combine two-part regex test by BrowserUk
in thread combine two-part regex test by perrin

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