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<title>The GNU Fortran Compiler: INDEX intrinsic</title>
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<a name="INDEX-intrinsic"></a>
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<p>
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Next: <a href="INT.html#INT" accesskey="n" rel="next">INT</a>, Previous: <a href="IMAGE_005fINDEX.html#IMAGE_005fINDEX" accesskey="p" rel="prev">IMAGE_INDEX</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="INDEX-_002d_002d_002d-Position-of-a-substring-within-a-string"></a>
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<h3 class="section">9.140 <code>INDEX</code> — Position of a substring within a string</h3>
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<a name="index-INDEX"></a>
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<a name="index-substring-position"></a>
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<a name="index-string_002c-find-substring"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>Returns the position of the start of the first occurrence of string
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<var>SUBSTRING</var> as a substring in <var>STRING</var>, counting from one. If
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<var>SUBSTRING</var> is not present in <var>STRING</var>, zero is returned. If
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the <var>BACK</var> argument is present and true, the return value is the
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start of the last occurrence rather than the first.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 77 and later, with <var>KIND</var> argument Fortran 2003 and later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Elemental function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = INDEX(STRING, SUBSTRING [, BACK [, KIND]])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>STRING</var></td><td width="70%">Shall be a scalar <code>CHARACTER</code>, with
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<code>INTENT(IN)</code></td></tr>
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<tr><td width="15%"><var>SUBSTRING</var></td><td width="70%">Shall be a scalar <code>CHARACTER</code>, with
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<code>INTENT(IN)</code></td></tr>
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<tr><td width="15%"><var>BACK</var></td><td width="70%">(Optional) Shall be a scalar <code>LOGICAL</code>, with
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<code>INTENT(IN)</code></td></tr>
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<tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization
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expression indicating the kind parameter of the result.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value is of type <code>INTEGER</code> and of kind <var>KIND</var>. If
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<var>KIND</var> is absent, the return value is of default integer kind.
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</p>
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</dd>
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<dt><em>Specific names</em>:</dt>
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<dd><table>
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<tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr>
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<tr><td width="20%"><code>INDEX(STRING, SUBSTRING)</code></td><td width="20%"><code>CHARACTER</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="25%">Fortran 77 and later</td></tr>
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</table>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="SCAN.html#SCAN">SCAN</a>, <a href="VERIFY.html#VERIFY">VERIFY</a>
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</p></dd>
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