PHP German Currency Regular Expression

I've been trying all sorts of strange combinations but just can't get my head around Regular Expressions, could somebody help me please. In Germany the , is used instead of a . and a . is used instead of a , e.g. Germen= 10.000,00 English= 10,000.00 I don't need a thousand seperator.

Allowed:

• 1
• 1,0
• 1,00
• ,5
• etc...

Not allowed:

• 1.0
• 1,000
• -,5
• abc
• 0,0€
• etc...

Is it pos开发者_开发问答sible to change the format with a Regular Expression so if someone were to enter: 2 or 2,0 it would be changed to 2,00 and if someone where to enter ,5 it would be changed to 0,50?

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Work with floats in php depends on your locale. You might want to see Manual