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<h3 class="section">8.208 <code>SCAN</code> — Scan a string for the presence of a set of characters</h3>
<p><a name="index-SCAN-964"></a><a name="index-string_002c-find-subset-965"></a>
<dl>
<dt><em>Description</em>:<dd>Scans a <var>STRING</var> for any of the characters in a <var>SET</var>
of characters.
<p>If <var>BACK</var> is either absent or equals <code>FALSE</code>, this function
returns the position of the leftmost character of <var>STRING</var> that is
in <var>SET</var>. If <var>BACK</var> equals <code>TRUE</code>, the rightmost position
is returned. If no character of <var>SET</var> is found in <var>STRING</var>, the
result is zero.
<br><dt><em>Standard</em>:<dd>Fortran 95 and later, with <var>KIND</var> argument Fortran 2003 and later
<br><dt><em>Class</em>:<dd>Elemental function
<br><dt><em>Syntax</em>:<dd><code>RESULT = SCAN(STRING, SET[, BACK [, KIND]])</code>
<br><dt><em>Arguments</em>:<dd>
<p><table summary=""><tr align="left"><td valign="top" width="15%"><var>STRING</var> </td><td valign="top" width="70%">Shall be of type <code>CHARACTER</code>.
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>SET</var> </td><td valign="top" width="70%">Shall be of type <code>CHARACTER</code>.
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>BACK</var> </td><td valign="top" width="70%">(Optional) shall be of type <code>LOGICAL</code>.
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>KIND</var> </td><td valign="top" width="70%">(Optional) An <code>INTEGER</code> initialization
expression indicating the kind parameter of the result.
<br></td></tr></table>
<br><dt><em>Return value</em>:<dd>The return value is of type <code>INTEGER</code> and of kind <var>KIND</var>. If
<var>KIND</var> is absent, the return value is of default integer kind.
<br><dt><em>Example</em>:<dd>
<pre class="smallexample"> PROGRAM test_scan
WRITE(*,*) SCAN("FORTRAN", "AO") ! 2, found 'O'
WRITE(*,*) SCAN("FORTRAN", "AO", .TRUE.) ! 6, found 'A'
WRITE(*,*) SCAN("FORTRAN", "C++") ! 0, found none
END PROGRAM
</pre>
<br><dt><em>See also</em>:<dd><a href="INDEX-intrinsic.html#INDEX-intrinsic">INDEX intrinsic</a>, <a href="VERIFY.html#VERIFY">VERIFY</a>
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