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Learn Red ? Fundamentals of Red
book

Learn Red ? Fundamentals of Red

by Ivo Balbaert
May 2018
Beginner content levelBeginner
252 pages
6h 19m
English
Packt Publishing
Content preview from Learn Red ? Fundamentals of Red

Matching positions

Parse pattern matches (or, in general, evaluates the rules) from left to right. You can visualize this with a position arrow, which points before the input at the start of the rules block:

When rules are matched, the parse position is moved. After the first pattern we get:

Then the some digit pattern processes the rest of the input, the parse position is at the end of the input, and true is returned:

If the input contains ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content