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- [x] Parse YQL grammar to extract lexer grammar into `TLexerGrammar`.
- [x] Translate `TLexerGrammar` into regexes.
- [x] Implement a lexer via regexes `TRegexLexer` to test generated regexes validity.
- [x] Test on `Default` syntax mode.
- [x] Test on `ANSI` syntax mode.
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- Related to https://github.com/ydb-platform/ydb/issues/15129
- Requirement for https://github.com/ytsaurus/ytsaurus/pull/1112
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Pull Request resolved: https://github.com/ytsaurus/ytsaurus/pull/1127
commit_hash:03ffffe81cdafe7f93a4d3fd9a3212fe67f1c72d
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