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Regular Expression !!!!!!

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when there is a pattern with regular expression: [a-c]x it means "ax" or "bx" or "cx". this works
But when i work with [c-a]x. i put the values "cx" or "ax" or "-x". it shows an ERROR. can anybody tell me what is the valid value for that [c-a]x expression
please reply soon...

thanks in advance
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The [c-a]x is NOT a valid pattern. To use regular expression, you have to make sure the put the range in the right order.
For example, in the [characterA-characterB], characterB must be greater or equal to characterA in order.
Hope this helps.
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