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>match-split</H1
><DIV
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><A
NAME="AEN481"
></A
><H2
>Name</H2
>match-split -- Splits string at target and returns the resulting list of tokens</DIV
><DIV
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NAME="AEN484"
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><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>(match-split string target)</PRE
></DIV
><DIV
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><A
NAME="AEN487"
></A
><H2
>Description</H2
><P
>Splits string at every occurance of target and returns the result
as a list. Note that <TT
CLASS="LITERAL"
>match-split</TT
> returns the occurances of <TT
CLASS="LITERAL"
>target</TT
>
in the list of tokens.</P
><P
></P
><DIV
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><DL
><DT
><TT
CLASS="LITERAL"
>string</TT
></DT
><DD
><P
>The string to split.</P
></DD
><DT
><TT
CLASS="LITERAL"
>target</TT
></DT
><DD
><P
>The string which is a delimiter between tokens</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN503"
></A
><H2
>Example</H2
><P
><TT
CLASS="LITERAL"
>"this is a test"</TT
> split at <TT
CLASS="LITERAL"
>"is"</TT
> returns
<TT
CLASS="LITERAL"
>("th" "is" " " "is" " a test")</TT
></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN509"
></A
><H2
>Author</H2
><P
>Norman Walsh, <ndw@nwalsh.com></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN512"
></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (match-split string target)
;; Splits string at target and returns the resulting list of tokens
(if (string? string)
(let loop ((result '()) (current "") (rest string))
(if (< (string-length rest) (string-length target))
(append result (if (equal? (string-append current rest) "")
'()
(list (string-append current rest))))
(if (equal? target (substring rest 0 (string-length target)))
(loop (append result
(if (equal? current "")
'()
(list current))
(list target))
""
(substring rest (string-length target)
(string-length rest)))
(loop result
(string-append current (substring rest 0 1))
(substring rest 1 (string-length rest))))))
(list string)))</PRE
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