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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

Executing code on a match

Inside a parse rule, we can provide code that will only be executed when a match is found. This code must be enclosed within parentheses ( ).

For example, here we simply print out the data variable, after the to rule has found a match:

parse rate [thru "<title>" copy data to "</title>" (print data) to end];1 USD = 0.81191502 EUR ;== true

Now let's turn to the complete rates file again—rates: read %rates.xml.

To parse through the complete file extracting information from each <title> tag, we can use any from the previous section as follows:

any [thru "<title>" copy data to "</title>"]

Each time it finds a <title> tag, the condition becomes true and the data is copied. Verify for yourself that all will not work here; ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content