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<?php $subject = 'http://distilleryimage3_s3_amazonaws_com/8af11cdcf11e286b022000ae90285_7_jpg'; $pattern = '/(_)([^7])/'; var_dump(preg_replace($pattern, '.\2', $subject));
Output for git.master, git.master_jit, rfc.property-hooks
string(76) "http://distilleryimage3.s3.amazonaws.com/8af11cdcf11e286b022000ae90285_7.jpg"

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