FLC OF COMMUTER ACFT ARE CLRED TO HOLD SHORT OF RWY PARALLEL TO THEIR LNDG. UNFAMILIAR WITH THE TXWYS THEY CROSS THE HOLD LINE; CATCH THE ERROR AND STOP SUDDENLY AS CTLR TELLS THEM TO HOLD POS.

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I; AS CAPT OF THE ACFT; WAS TAXIING AFTER OUR LNDG AT ONT. SOME ISSUES AROSE ON THE VISUAL APCH TO ONT ARPT THAT BOTH MYSELF AND THE FO WERE STILL FOCUSED ON AFTER LNDG (IE; WE WERE SOMEWHAT DISTRACTED AFTER LNDG). WE LANDED ON RWY 8L; OUT OF OUR NORMAL ROUTINE OF USING THE RWYS 26. TWR ISSUED A 'HOLD SHORT OF RWY 8R' CLRNC. I EXITED RWY 8L AT TXWY U; THOUGHT I WOULD CROSS A PARALLEL TXWY PRIOR TO FINDING THE HOLD SHORT LINE FOR RWY 8R; THEN REALIZED I HAD JUST STARTED TO CROSS THE RWY 8R HOLD SHORT LINE (I SAW IT AT THE SAME TIME THE FO SAID 'STOP;' AND THAT TWR SAID 'HOLD YOUR POS'). AN ACFT WAS ROLLING OUT ON RWY 8R. THERE WERE NO AMBER LIGHTS EMBEDDED IN THE HOLD SHORT LINE. CONTRIBUTING FACTORS -- DISTR FROM APCH EVENTS; NIGHT AND USING ABNORMAL RWY; EXPECTING TO CROSS A PARALLEL TXWY AS A CUE TO WHERE I WAS (BUT THE TXWY ENDED HALF-WAY BACK ON THE RWYS); SHORT TAXI DISTANCE BTWN RWYS 8L AND 8R; NO AMBER LIGHTS IN HOLD SHORT LINE. SUPPLEMENTAL INFO FROM ACN 387881: THIS WAS DAY 5 OF OUR SCHEDULE AND WE WERE BOTH TIRED AND DISTRACTED BY OUR FATIGUE ENOUGH TO COMMENT ON IT. OUR SCHEDULES HAVE RECENTLY CHANGED FROM 4 ON 3 OFF TO 5 ON 2 OFF AND THIS TRANSITION WAS HITTING US HARD. IT WOULD HAVE HELPED OUR POS AWARENESS TO REVIEW THE ARPT DIAGRAM PRIOR TO LNDG ONCE WE KNEW OF THE NON-STANDARD RWY 8L APCH. SINCE WE USUALLY LAND ON RWY 26R; WE ARE NOT FAMILIAR WITH THE TXWYS AT THE FAR END OF THE RWY.