The performance of PetitParserDart? about dart-petitparser HOT 1 CLOSED

It depends.

PetitParser can be fast, depending on what you parse, how you wrote your parser and how you parse. PetitParser is more powerful, as you can have recursion and production actions. Additionally, PetitParser is not limited to strings, you can parse and match any list of objects. PetitParser gets slightly faster over time as the Dart VM starts to JIT its code.

Keep in mind that the semantics of regular expressions and parsing expression grammars are very different. For example, the star() and plus() operators are greedy, consuming as much input as possible. The operators starGreedy() and starLacy() that I recently added can help you there if you need.

Regarding the test you could write it using Parser.matchesSkipping(String) to make it simpler and look more like a regular expression:

final petitParser = digit().plus().flatten();

petitTest() {
  for (var m in petitParser.matchesSkipping(s)) {
    m;
  }
}

from dart-petitparser.