Regular Expression for match pattern

Hi guys, I need some help.
In one part of my test system, I give to the program a sequence of temperatures, which are numbers separated by a comma. Due to a possible error, the user can forget the coma, and the program gets unexpected values.
For example, "20, 70, -10" is a right value, whereas "20 70, -10" would be a wrong one.
Which regular expression will detect this comma absence?
Thanx in advance.

OK, makes it more difficult (and more fun )
My original version failed also when the space was forgotten. DOH!
Try this version. It get's complicated cause the scan from string likes ignoring spaces... So we change the spaces
Hope this helps
Shane.
PS The ideas given by others are still a better solution, but if you're stuck........
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)
Attachments:
Check input string with commas(array).vi ‏39 KB

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VOLTS
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