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Note that you can use JavaScript to define terms #765

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Note that you can use JavaScript to define terms #765

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6 changes: 6 additions & 0 deletions docs/labs/create_checker.md
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Expand Up @@ -474,6 +474,12 @@ Regular expressions make it easy to describe many patterns.
However, it's sometimes useful to give certain sequences names, or
use the same sequence in different circumstances.

You can use JavaScript to define values, and even use values to compute
other values. By convention constants are usually in uppercase letters, e.g.,
`FOO = "bar";`. In a template you can use them using `${...}`, for example,
`${FOO}`.

If you doh't want to use JavaScript's mechanisms, there is an alternative.
Checker allows you to define named terms, and then use them in a regular
expression.
This is done in the `definitions` section, which is a sequence
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