Regex to remove comments from SQL Query String using JavaScript

Question

I managed to find the regex for handling /* */ cases but it doesn't work well for -- cases. How can I change my regex to fix this?

var s = `SELECT * FROM TABLE_A
/* first line of comment
   second line of comment */
   -- remove this comment too
   SELECT * FROM TABLE_B`;

var stringWithoutComments = s.replace(/(\/\*[^*]*\*\/)|(\/\/[^*]*)|(--[^*]*)/g, '');
/*
Expected:

SELECT * FROM TABLE_A
SELECT * FROM TABLE_B
*/
console.log(stringWithoutComments);

Thank you

https://jsfiddle.net/8fuz7sxd/1/

Answer 1

 var s = `SELECT * FROM TABLE_A /* first line of comment second line of comment */ -- remove this comment too SELECT * FROM TABLE_B`; var stringWithoutComments = s.replace(/(\\/\\*[^*]*\\*\\/)|(\\/\\/[^*]*)|(--[^.].*)/gm, ''); /* Expected: SELECT * FROM TABLE_A SELECT * FROM TABLE_B */ console.log(stringWithoutComments); // without linebreak stringWithoutComments = stringWithoutComments.replace(/^\\s*\\n/gm, "") console.log(stringWithoutComments); // without whitespace stringWithoutComments = stringWithoutComments.replace(/^\\s+/gm, "") console.log(stringWithoutComments);