University of Michigan - Ann Arbor

When creating a custom regex-based lexer in Pygments, the base class and helper functions are imported from `pygments.lexer`:

```python
from pygments.lexer import RegexLexer, include, words, bygroups, using, this
```

This import provides `RegexLexer` alongside lexer construction utilities such as `include`, `words`, `bygroups`, `using`, and `this`.

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