pegs_example.nim

import pegs

let p = peg"""
function_call <- \ident '(' parameters ')'
parameters    <- (parens / string / [^)] )*
parens        <- '(' parameters ')'

string    <- dq_string / sq_string
dq_string <- DQUOTE (BSLASH . / [^DQUOTE])* DQUOTE
sq_string <- SQUOTE (BSLASH . / [^SQUOTE])* SQUOTE

DQUOTE <- '"'
SQUOTE <- "'"
BSLASH <- "\\"
"""

echo match("hello(a b c)", p)