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Asked: 2026-06-11T15:41:52+00:00

I am writing a tiny javascript parser in javascript. I am at the tokenization

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I am writing a tiny javascript parser in javascript.
I am at the tokenization level.

I would like to know how to recognize when a regular expression begins and ends.

For example, if I had asked the same question about how to recognize when a string
begins and ends the answer would be:

for a string beginning with double quotes ”
I know that the answer is
string begins with double quotes ”
and ends when the next double quotes ” is encountered (except if preceded by backward-slash \)

any help appreciated

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1 Answer

  1. Editorial Team

    The ECMAScript language specification contains a full grammar for the language (in EBNF) in Annex A. It’s too large to reproduce here in its entirety, but the production for regular expressions is given as “RegularExpressionLiteral”.

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