How does TextX defines boundaries between words?

Question

Consider the following made up example with 3 rules.

Model: id_1=Ident 'is' id_2=Ident;

Keyword: 'is';

Ident: !Keyword ID;

It seems like TextX cannot parse inputs where id_2 starts with "is", e.g., "Tom is isolated". I get the following error: None:1:7: error: Expected Not at position ../test.txt:(1, 7) => 'Tom is* isolated'. Why is that happening? Shouldn't "isolated" be considered as one word that is different from "is"? TextX can parse the input if id_2 does not start with "is".

Is there anyway to solve this problem?

Thanks!

Answer 1

textX doesn't assume by default that matching should be done on word boundaries. To solve your problem you can either define keywords to match on word boundaries like:

Keyword: /\bis\b/;

or use auto keywords feature which can be turned on using autokwd=True in metamodel_from_file/str calls.