Failed to parse mongodb url regular expression

[soufianos01]

Hi,

while trying to parse a code that connects to a mongodb database, acorn in its latest version has a problem dealing with this regular expression: '^(?<protocol>[^/]+):\\/\\/(?:(?<username>[^:@]*)(?::(?<password>[^@]*))?@)?(?<hosts>(?!:)[^/?@]*)(?<rest>.*)'

Here is the error:

SyntaxError: Invalid regular expression: /^(?<protocol>[^/]+):\/\/(?:(?<username>[^:@]*)(?::(?<password>[^@]*))?@)?(?<hosts>(?!:)[^/?@]*)(?<rest>.*)/: Invalid group (12:21)
    at Parser.pp$4.raise (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3459:15)
    at RegExpValidationState.raise (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3705:17)
    at Parser.pp$1.regexp_eatCapturingGroup (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:4013:15)
    at Parser.pp$1.regexp_eatExtendedAtom (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:4032:12)
    at Parser.pp$1.regexp_eatTerm (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3882:59)
    at Parser.pp$1.regexp_alternative (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3863:52)
    at Parser.pp$1.regexp_disjunction (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3847:10)
    at Parser.pp$1.regexp_pattern (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3822:10)
    at Parser.pp$1.validateRegExpPattern (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:3798:10)
    at Parser.pp.readRegexp (/mnt/home/usr/Documents/jalangi2/node_modules/acorn/dist/acorn.js:5154:10) {
  pos: 656,
  loc: Position { line: 12, column: 21 },
  raisedAt: 763

[marijnh]

Can you show how you're testing this? This parses fine:

const { parse } = require('acorn')
const re = '/^(?<protocol>[^/]+):\\/\\/(?:(?<username>[^:@]*)(?::(?<password>[^@]*))?@)?(?<hosts>(?!:)[^/?@]*)(?<rest>.*)/'
console.log(parse(re, {ecmaVersion: "latest"}))

[soufianos01]

Thanks for your reply! Yes, changing the ecmaVersion to latest solves my problem