• O --> common misspellings
• Z --> real-word misspellings
• I --> internet slang
• C --> case use (proper names and acronyms)
• CC --> case use (start of sentence)
• S --> glued words
• P --> punctuation

• <wrong_word>*<TAG>[expected_word]
• videos*O[vídeos]
• da*Z[dá]
• ñ*I[não]
• skype*C[Skype]

ps: punctuation tag *P[.] just indicates missing periods.

Duran, M. S.; Avanço, L. V.; Nunes, M. G. V. (2015). A Normalizer for UGC in Brazilian Portuguese. In: ACL 2015, Workshop on Noisy User-generated Text - WNUT, 2015, Beijing, China, p. 38-47. https://aclanthology.org/W15-4305/