The answer
Many tokenizer libraries provide offset mappings that connect tokens to original character spans. The precise behavior depends on normalization, special tokens, and the library being used.
How does a tokenizer divide text into smaller units?
Can a tokenizer show which text produced each token?
More FAQs in How does a tokenizer divide text into smaller units?
Some vocabularies include whitespace as part of a token or encode word boundaries explicitly. A leading space can therefore change the units selected for otherwise identical letters.
The tokenizer typically applies an already learned vocabulary and merge rules during inference. Learning those rules is a separate preparation step from generating an answer.
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