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Nim2 /

Extract data from a formatted string

See also:

scanf()
from parse import parse


def main():
    s = "mul(11,8)"

    p = parse("mul({a},{b})", s)

    print(p["a"])  # "11"
    print(p["b"])  # "8"
import std/strscans


let s = "mul(11,8)"

var a, b: int

if s.scanf("mul($i,$i)", a, b):
  echo a  # 11 ; as int
  echo b  # 8  ; as int


var v1, v2: string

if s.scanf("mul($+,$+)", v1, v2):
  echo v1  # "11" ; as string
  echo v2  # "8"  ; as string

This is a 3rd-party library. You can install it with pip.

  • scanf() returns true if the operation was successful; false otherwise
  • $i: integer
  • $+: string whose length is at least 1

The most important constructions (see the docs for a full list):

$i Matches a decimal integer. Uses parseInt.
$f Matches a floating-point number. Uses parseFloat.
$c Matches a single ASCII character.
$s Skips optional whitespace(s). Matches multiple whitespace characters.
$$ Matches a single dollar sign.
$* Matches until the token following the $* was found. The match is allowed to be of 0 length.
$+ Matches until the token following the $+ was found. The match must consist of at least one char.

This module has another useful macro called scanTuple(). You can check that out too.

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Page last modified on 2026 June 04, 16:19