Prints obj with human-readable indention to current-output-port.
(picrin regexp)
---------------
-**(regexp ptrn [flags])**
Compiles pattern string into a regexp object. A string flags may contain any of #\g, #\i, #\m.
-**(regexp? obj)**
Judges if obj is a regexp object or not.
-**(regexp-match re input)**
Returns two values: a list of match strings, and a list of match indeces.
-**(regexp-replace re input txt)**
-**(regexp-split re input)**
SRFI libraries
--------------
- `(srfi 1)
<http://srfi.schemers.org/srfi-1/>`_
List library.
- `(srfi 8)
<http://srfi.schemers.org/srfi-8/>`_
``receive`` macro.
- `(srfi 17)
<http://srfi.schemers.org/srfi-17/>`_
Generalized set!
- `(srfi 26)
<http://srfi.schemers.org/srfi-26/>`_
Cut/cute macros.
- `(srfi 43)
<http://srfi.schemers.org/srfi-43/>`_
Vector library.
- `(srfi 60)
<http://srfi.schemers.org/srfi-60/>`_
Bitwise operations.
- `(srfi 95)
<http://srfi.schemers.org/srfi-95/>`_
Sorting and Marging.
- `(srfi 111)
<http://srfi.schemers.org/srfi-111/>`_
Boxes
(picrin control list)
---------------------
Monadic list operators.
The triple of for/in/yield enables you to write a list operation in a very easy and simple code. One of the best examples is list composition::
(for (let ((a (in '(1 2 3)))
(b (in '(2 3 4))))
(yield (+ a b))))
;=> (5 6 7 6 7 8 7 8 9)
All monadic operations are done in *for* macro. In this example, *in* operators choose an element from the given lists, a and b are bound here, then *yielding* the sum of them. Because a and b are values moving around in the list elements, the expression (+ a b) can become every possible result. *yield* operator is a operator that gathers the possibilities into a list, so *for* macro returns a list of 3 * 3 results in total. Since expression inside *for* macro is a normal expression, you can write everything that you can write elsewhere. The code below has perfectly the same effect to above one::
(for (yield (+ (in '(1 2 3))
(in '(4 5 6)))))
The second best exmaple is filtering. In the next case, we show that you can do something depending on the condition of chosen elements::
(for (let ((x (in (iota 10))))
(if (even? x)
(yield x)
(null))))
;=> (0 2 4 6 8)
This expression is equivalent to ``(filter even? (iota 10))`` but it is more procedual and non-magical.
-**(for expr)**
[Macro] Executes expr in a list monad context.
-**(in list)**
Choose a value from list. *in* function must only appear in *for* macro. The delimited continuation from the position of *in* function to the outside *for* macro is executed for each element in list. If list contains no values, that is ``(in '())``, the continuation is discarded.
-**(yield value)**
Yields value from the monad context. The result of *for* will be a list of yielded values.
-**(null . value)**
Returns ``()`` whatever value is given. The identity element of list composition. This operator corresponds to Haskell's fail method of Monad class.
