regex - Controlling number of characters in expression? -

can somehow limit number of characters of whole expression?

i want limit number of characters in expression like:

([0-9]+(\.?[0-9]+)*) 

i want strings following limit accepted. example, if limit 4:

• 12.3 gets accepted
• 012 doesn't
• 12345 doesn't.

use anchored ahead (for example max 33):

^(?=.{0,33}$)([0-9]+(\.?[0-9]+)*) 

to make exactly 33, remove 0,

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to ignore number of periods in limit

^(?=(\.*[^.]){0,33}\.*$)([0-9]+(\.?[0-9]+)*)