I searched the Irish Family History Foundation's database. It contains 12,000,000 surviving rcds for abt 65% of Irish counties. Rcds are increasingly sparse B4 1840, rare B4 1800. Caution - The IFHF charges a 5 euro fee per rcd to view the details.
Note 1 - Without a KNOWN parish, the chance of an ancestor's rcds NOT being in this database is AT LEAST 35%.
Note 2 - Only 1/2 of Co. Cork's rcds are in this database.
Note 3 - The RC church kept control over most parish rcds from Tipperary (north). These are ONLY available thru the Tipperary Family History Research center at a substantial fee (regardless of outcome).
Note 4 - Each parish's rcds have their own quirks and limitations, too many to enumerate individually.
For Ellen Driscoll B 1872 (exact) somewhere in Ireland with the father forenamed John, I found 1 B rcd in CRK.
For Mary O'Herlihy M 1867 +/- 4 yrs somewhere in Ireland (Likely Cork), I found 29 M rcds: 1864 ROS, 1865 CRK, 3-1865 LIM, 3-1865 CRK, 1-1866 CRK, 1866 GAL, 1866 TIP, 1866 ROS, 2-1868 CRK, 2-1868 KIL, 3-1869 GAL, 1-1869 TIP, 3-1869 ROS, 2-1869 LIM, 1-1869 KIL, 1871 CRK, 2-1871 LIM.
For John Driscoll M ditto, I found 9 M rcds: 1863 DUB, 1864 ANT, 2-1864 LIM, 2-1869 TIP, 2-1869 CRK, 1-1869 TIP.
Tipperary seems to be the only date/county combination in common in this search range. Suggest you search 1869 Tipperary rcds at the parish level to see if there are M rcds in the same parish. If so, these rcds are LIKELY for your ancestors.
Google the foundation's name to lead you to this database. Register, opt to be notified as rcds are added and browse. Pls post your search results to my genform msg.