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regex back matching

Hello I need to match on lines where the 4 quadrant of the ip is even with one line regex. For example, if I have 192.68.45.78 daskjaskjf asdfjkasjf asfkasfklh 192.68.34.62 ADKDAK Dkkslaslk jjsdkdldj 192.68.23 INEED HELP PLEASE 192.68.67.34 dkasdfkl kasfkasfkakf

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