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<title>The GNU Fortran Compiler: VERIFY</title>
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<hr>
<a name="VERIFY-_002d_002d_002d-Scan-a-string-for-characters-not-a-given-set"></a>
<h3 class="section">8.256 <code>VERIFY</code> &mdash; Scan a string for characters not a given set</h3>
<a name="index-VERIFY"></a>
<a name="index-string_002c-find-missing-set"></a>
<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p>Verifies that all the characters in <var>STRING</var> belong to the set of
characters in <var>SET</var>.
</p>
<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
not in <var>SET</var>. If <var>BACK</var> equals <code>TRUE</code>, the rightmost
position is returned. If all characters of <var>STRING</var> are found in
<var>SET</var>, the result is zero.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>Fortran 95 and later, with <var>KIND</var> argument Fortran 2003 and later
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Elemental function
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>RESULT = VERIFY(STRING, SET[, BACK [, KIND]])</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>STRING</var></td><td width="70%">Shall be of type <code>CHARACTER</code>.</td></tr>
<tr><td width="15%"><var>SET</var></td><td width="70%">Shall be of type <code>CHARACTER</code>.</td></tr>
<tr><td width="15%"><var>BACK</var></td><td width="70%">(Optional) shall be of type <code>LOGICAL</code>.</td></tr>
<tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization
expression indicating the kind parameter of the result.</td></tr>
</table>
</dd>
<dt><em>Return value</em>:</dt>
<dd><p>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.
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">PROGRAM test_verify
WRITE(*,*) VERIFY(&quot;FORTRAN&quot;, &quot;AO&quot;) ! 1, found 'F'
WRITE(*,*) VERIFY(&quot;FORTRAN&quot;, &quot;FOO&quot;) ! 3, found 'R'
WRITE(*,*) VERIFY(&quot;FORTRAN&quot;, &quot;C++&quot;) ! 1, found 'F'
WRITE(*,*) VERIFY(&quot;FORTRAN&quot;, &quot;C++&quot;, .TRUE.) ! 7, found 'N'
WRITE(*,*) VERIFY(&quot;FORTRAN&quot;, &quot;FORTRAN&quot;) ! 0' found none
END PROGRAM
</pre></div>
</dd>
<dt><em>See also</em>:</dt>
<dd><p><a href="SCAN.html#SCAN">SCAN</a>, <a href="INDEX-intrinsic.html#INDEX-intrinsic">INDEX intrinsic</a>
</p></dd>
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