Regular expression for decimal number

by 
^[0-9]([.,][0-9]{1,3})?$

It allows:

0
1
1.2
1.02
1.003
1.030
1,2
1,23
1,234

BUT NOT:

.1
,1
12.1
12,1
1.
1,
1.2345
1,2345

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