Code to check whether a given string contains alphanumeric

Question

Can anyone post the Code to check whether a given string contains only alphanumeric and no special characters

Answer 1

<Rule name='isAlphaNumericString'>
<RuleArgument name='testStr'/>
<block>
<defvar name='counter'>
<i>0</i>
</defvar>
<defvar name='splitString'>
<while>
<lt>
<ref>counter</ref>
<length>
<ref>testStr</ref>
</length>
</lt>
<append name='splitList'>
<substr>
<ref>testStr</ref>
<ref>counter</ref>
<i>1</i>
</substr>
</append>
<set name='counter'>
<add>
<ref>counter</ref>
<i>1</i>
</add>
</set>
</while>
<ref>splitList</ref>
</defvar>
<containsAll>
<list>
<s>A</s>
<s>B</s>
<s>C</s>
<s>D</s>
<s>E</s>
<s>F</s>
<s>G</s>
<s>H</s>
<s>I</s>
<s>J</s>
<s>K</s>
<s>L</s>
<s>M</s>
<s>N</s>
<s>O</s>
<s>P</s>
<s>Q</s>
<s>R</s>
<s>S</s>
<s>T</s>
<s>U</s>
<s>V</s>
<s>W</s>
<s>X</s>
<s>Y</s>
<s>Z</s>
<s>a</s>
<s>b</s>
<s>c</s>
<s>d</s>
<s>e</s>
<s>f</s>
<s>g</s>
<s>h</s>
<s>i</s>
<s>j</s>
<s>k</s>
<s>l</s>
<s>m</s>
<s>n</s>
<s>o</s>
<s>p</s>
<s>q</s>
<s>r</s>
<s>s</s>
<s>t</s>
<s>u</s>
<s>v</s>
<s>w</s>
<s>x</s>
<s>y</s>
<s>z</s>
<s>0</s>
<s>1</s>
<s>2</s>
<s>3</s>
<s>4</s>
<s>5</s>
<s>6</s>
<s>7</s>
<s>8</s>
<s>9</s>
</list>
<ref>splitString</ref>
</containsAll>
</block>
</Rule>
It Retruns 1 if it contains only alphanumeric otherwise 0