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(Creating Strings): Update split-string specification and examples.

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Juanma Barranquero
2003-05-22 21:05:25 +00:00
parent 6a64662696
commit 3aeea9e980
1 changed files with 29 additions and 13 deletions
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lispref/strings.texi
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@@ -259,32 +259,48 @@ description of @code{mapconcat} in @ref{Mapping Functions},
Lists}.
@end defun
@defun split-string string separators
@defun split-string string separators omit-nulls
This function splits @var{string} into substrings at matches for the regular
expression @var{separators}. Each match for @var{separators} defines a
splitting point; the substrings between the splitting points are made
into a list, which is the value returned by @code{split-string}.
into a list, which is the value returned by @code{split-string}. If
@var{omit-nulls} is @code{t}, null strings will be removed from the
result list. Otherwise, null strings are left in the result.
If @var{separators} is @code{nil} (or omitted),
the default is @code{"[ \f\t\n\r\v]+"}.
the default is the value of @code{split-string-default-separators}.
For example,
@defvar split-string-default-separators
The default value of @var{separators} for @code{split-string}, initially
@samp{"[ \f\t\n\r\v]+"}.
As a special case, when @var{separators} is @code{nil} (or omitted),
null strings are always omitted from the result. Thus:
@example
(split-string " two words ")
@result{} ("two" "words")
@end example
The result is not @samp{("" "two" "words" "")}, which would rarely be
useful. If you need such a result, use an explict value for
@var{separators}:
@example
(split-string " two words " split-string-default-separators)
@result{} ("" "two" "words" "")
@end example
More examples:
@example
(split-string "Soup is good food" "o")
@result{} ("S" "up is g" "" "d f" "" "d")
(split-string "Soup is good food" "o" t)
@result{} ("S" "up is g" "d f" "d")
(split-string "Soup is good food" "o+")
@result{} ("S" "up is g" "d f" "d")
@end example
When there is a match adjacent to the beginning or end of the string,
this does not cause a null string to appear at the beginning or end
of the list:
@example
(split-string "out to moo" "o+")
@result{} ("ut t" " m")
@end example
Empty matches do count, when not adjacent to another match:
@example