import re, strutils

proc main() =
  # This tests whether a pattern matches a string.
  let match = "peach".match(re"p([a-z]+)ch")
  echo match

  # Above we used a string pattern directly, but for
  # other regexp tasks you'll need to compile an
  # optimized Regex object.
  let r = re"p([a-z]+)ch"

  # Many methods are available on these objects. Here's
  # a match test like we saw earlier.
  echo "peach".match(r)

  # This finds the match for the regexp.
  echo "peach punch".find(r)

  # This also finds the first match but returns the
  # start and end indexes for the match instead of the
  # matching text.
  echo "idx: ", "peach punch".findBounds(r)

  # The `captures` variant include information about
  # both the whole-pattern matches and the submatches
  # within those matches. For example this will return
  # information for both `p([a-z]+)ch` and `([a-z]+)`.
  echo "peach punch".findAll(r)

  # Similarly this will return information about the
  # indexes of matches and submatches.
  echo "peach punch".findAllBounds(r)

  # The `findAll` function applies to all
  # matches in the input, not just the first.
  echo "peach punch pinch".findAll(r)

  # Providing a non-negative integer as the second
  # argument to these functions will limit the number
  # of matches.
  echo "peach punch pinch".findAll(r, 2)

  # Our examples above had string arguments and used
  # names like `match`. We can also provide
  # string arguments directly.
  echo "peach".match(r)

  # The `re` package can also be used to replace
  # subsets of strings with other values.
  echo "a peach".replace(r, "<fruit>")

  # The `proc` variant allows you to transform matched
  # text with a given function.
  echo "a peach".replace(r, proc(m: string): string = m.toUpperAscii)

main()