[String->IsDigit] checks whether a specified character within the string object is a digit. If the parameter specifying the position of the character to be examined is omitted, then the default position 1 (or first character in the string object) is examined. The tag returns True if the character is a digit or False otherwise.
Use the [String->IsDigit] method. The following example returns True since the seventh character of the string is a digit.
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