Unable to use Regex in rules for Parboiled2

[sanjyot bandal]

Hi,

I want to convert my current code written using Scala Parser Combinator(Packrat Parser) to Parboiled2 Parser.
But Parboiled2 Parser is not allowing me to use any kind of Regex while writing Rules.

For example:
Consider following sample code snippet written using Scala Parser Combinator:
 def sampleGrammarRule(): PackratParser[String] = "(?i)hello".r ~ "(?i)world".r ^^ {
  case str1 ~ str2 => {
   //...
  } 
 }

In short, it is grammar rule to match 'hello world' case insensitive.
 
But using Parboiled2 Parser, I am unable to use Regex (ex: "(?i)hello".r).
Please help me to use Regex while writing grammar rules with Parboiled2.
A small code snippet would be of great help.

Thanks in advance.
Sanjyot

[Mathias Doenitz]

Sanjyot,

if you already have a parser written in Scala Parser Combinators
I'd recommend you turn to fastparse (http://www.lihaoyi.com/fastparse/) rather than parboiled.

The syntax and logic will be more familiar, the project is better maintained with a larger user base,
and the performance is almost on par with what pb2 offers.

Cheers,
Mathias

---
mat...@parboiled.org
http://www.parboiled.org

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[sanjyot bandal]

Thanks Mathias for prompt reply.

Will check and try to use FastParse.

Regards,

Sanjyot.