If enabled, any occurrence of \\N, where N is an integer number, will be replaced with the corresponding capture ("parenthesized substring") from the pattern. To include (a literal \\N in your replacement, put an extra backslash in front of it, like \\\\N.
Leis an rogha seo, cuirfear an teaghrán gafa cuí ("fotheaghrán lúibíneach") ón phatrún in ionad gach\\ N. Is slánuimhir é N anseo. Chun\\ N litriúil a chur san áireamh, cuir cúlslais bhreise os a chomhair:\\\\ N.