p">)</span><span class="w"> </span><span class="c">! space,horizontal tab, newline, carriage return</span>
<span class="w">   </span><span class="k">endif</span><span class="w"></span>
<span class="c">!-----------------------------------------------------------------------------------------------------------------------------------</span>
<span class="w">   </span><span class="n">isource_len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">source_string</span>