dia daoibh, just reading Pearse's An Dearg-Daol and one sentence caught my eye grammar wise, "Bhí an t-uisce isteach im bhéal aguse im shúile agus im chluasa" im assuming that "im" here is just a combination of "i" and "mo", Im guessing that in speech its just another one of those examples of certain words blending together, but i was just wondering, is it any less informal/formal to write etc?

'maith agaibh

Yes, "im" is a contraction of "i" and "mo", and it's something from Munster.

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Agreeing...just to expand on this a bit (based on Cliathach's question): It wouldn't be considered "informal" in the way that using contractions might be in some cases in English. It's a legitimate written feature of the Munster dialect.

Redwolf

And to add that in other dialects, it is more often written i m' and you'll often see that form in songs.

im and related dod, etc., have a certain neatness to them.

On the other hand, i m', do d', etc., retain the original structure, i.e., i mo, do do, etc., and make it clear something has been dropped.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).