Search code examples
regexjison

JISON: why in regexp used "." instead of \.?

From example on http://zaach.github.io/jison/docs/#specifying-a-language

[0-9]+("."[0-9]+)?\b  return 'NUMBER';

why in this regexp used "." instead of \. ?

Solution

  • Because that's a Jison grammar tokenization rule not an exact regex.
    In Jison a token is surrounded in ".

    In the compiled rules you can see the rule converted to a regex:

    ["[0-9]+(?:\\.[0-9]+)?\\b", "return 'NUMBER';"],