<RefEntry id="repl-substringX3F">
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<?html-filename repl-substring-p.html>

<RefMeta>
  <RefEntryTitle>repl-substring?</RefEntryTitle>
  <RefMiscInfo Role="file">dblib.dsl</RefMiscInfo>
</RefMeta>

<RefNameDiv>
  <RefName>repl-substring?</RefName>
  <RefPurpose>Returns true if the specified substring can be replaced</RefPurpose>
</RefNameDiv>

<RefSynopsisDiv><Title>Synopsis</Title>
<Synopsis>
(repl-substring? string target pos)
</Synopsis>
</RefSynopsisDiv>

<RefSect1><Title>Description</Title>

<para>
Returns <literal>#t</literal> if <literal>target</literal> occurs at <literal>pos</literal> in <literal>string</literal>.</para>


</RefSect1>

<RefSect1><Title>Author</Title>

<para>
Norman Walsh, &lt;ndw@nwalsh.com&gt;
</para>
</RefSect1>
<RefSect1><Title>Source Code</Title>

<ProgramListing>
(define (repl-substring? string target pos)
  ;; Returns true if the specified substring can be replaced
  (let* ((could-match (<= (+ pos (string-length target)) 
			 (string-length string)))
	 (match (if could-match 
		    (substring string pos (+ pos (string-length target))) "")))
    (and could-match (string=? match target))))
</ProgramListing>
</RefSect1>

</RefEntry>
