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POFoxPro functions which determine if a variable is a character string or a numeric string
 

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  1. POFoxPro functions which determine if a variable is a character string or a numeric string
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    <p>I'm looking for a Visual FoxPro function which is similar to the PHP function <a href="http://php.net/manual/en/function.is-numeric.php" rel="nofollow noreferrer">is_numeric()</a>.<br> I have found <a href="https://stackoverflow.com/questions/7563907/function-to-know-that-a-variable-is-string-or-number-on-foxpro">this</a>, but I could not use <code>VARTYPE</code> or <code>TYPE</code> because the variable is always a character string which contains digits only.</p> <p>I found <code>ISDIGIT()</code> function, but the manual says that it only checks the first character.</p> <blockquote> <p>Determines whether the leftmost character of the specified character expression is a digit (0 through 9).</p> <pre><code> ISDIGIT(cExpression) </code></pre> <p><strong>Parameters</strong><br> <em>cExpression</em> </p> <p>Specifies the character expression that ISDIGIT( ) tests. Any characters after the first character in cExpression are ignored.</p> </blockquote> <p>I would create my own function using the regular expression object <code>VBScript.RegExp</code></p> <pre><code>FUNCTION isNumeric( tcValue ) LOCAL oRE oRE = CreateObject("VBScript.RegExp") oRE.Pattern = '^[0-9]+$' RETURN oRE.test( tcValue ) ENDFUNC ? isNumeric( '123' ) </code></pre> <p>But, is there any function provided by FoxPro for this purpose?<br> Am I just overlooking?</p> <p>Also same for <code>ISALHPA()</code> which determines whether the leftmost character in a character expression is alphabetic. I want to check if the variable contain only alphabets.</p>
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    1. CONo, there is no language function that does this. A function like Frank has posted below is the only way.
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