(eval-string str [err-display err-result]) PROCEDURE
Reads and evaluates S-expressions from the string str, returning
a result for each expression. Note that if str contains only
whitespace and comments, zero values are returned, while if str
contains two expressions, two values are returned.
If err-display is not #f (the default), then errors are
caught and err-display is used as the error display handler. If
err-result is specified, it must be a thunk
that returns a value to be returned when an error is caught;
otherwise, #f is returned when an error is caught.
Prints expr into a string and returns the string.
(read-from-string str [err-display err-result]) PROCEDURE
Reads the first S-expression from the string str and returns it.
The err-display and err-result are as in eval-str.
(read-from-string-all str [err-display err-result]) PROCEDURE
Reads all S-expressions from the string str and returns them in a list.
The err-display and err-result are as in eval-str.
(regexp-match* pattern str [start-k end-k]) PROCEDURE
Like regexp-match (see section 10 in PLT MzScheme: Language Manual), but the result is
a list of strings corresponding to a sequence of matches of
pattern in str. (Unlike regexp-match, results
for parenthesized sub-patterns in pattern are not returned.)
If pattern matches a zero-length string along the way, the
exn:user exception is raised.
If str contains no matches (in the range start to
end), null is returned. Otherwise, each string in the
resulting list is a distinct substring of str that matches
pattern.
(regexp-match-exact? pattern str) PROCEDURE
This procedure is like MzScheme's built-in regexp-match (see
section 10 in PLT MzScheme: Language Manual), but the result is always #t or
#f; #t is only returned when the entire string
str matches pattern.
(regexp-match-positions* pattern str [start-k end-k]) PROCEDURE
Like regexp-match-positions (see section 10 in PLT MzScheme: Language Manual), but the
result is a list of integer pairs corresponding to a sequence of
matches of pattern in str. (Unlike
regexp-match-positions, results for parenthesized
sub-patterns in pattern are not returned.) If pattern
matches a zero-length string along the way, the exn:user exception is raised.
If str contains no matches, null is returned.
(regexp-quote str [case-sensitive?]) PROCEDURE
Produces a string suitable for use with regexpstr. If case-sensitive? is true, the resulting regexp
matches letters in str case-insensitively, otherwise (and by
default) it matches case-sensitively.
(regexp-replace-quote str) PROCEDURE
Produces a string suitable for use as the third argument to
regexp-replacestr as a
replacement. Concretely, every backslash in str is protected by
a quoting backslash.
(regexp-split pattern str [start-k end-k]) PROCEDURE
The complement of regexp-match* (see above): the result is a
list of sub-strings in str that are separated by matches to
pattern; adjacent matches are separated with "". If
pattern matches a zero-length string along the way, the
exn:user exception is raised.
If str contains no matches (in the range start to
end), the result will be a list containing str (from
start to end). If a match occurs at the beginning of
str (at start), the resulting list will start with an
empty string, and if a match occurs at the end (at end), the
list will end with an empty string.
(string-lowercase! str) PROCEDURE
Destructively changes str to contain only lowercase characters.
(string-uppercase! str) PROCEDURE
Destructively changes str to contain only uppercase characters.