Fontanka135

>>> import re
>>> s='a2323423'
>>> re.search(r'^[^p]\d+',s)
<_sre.SRE_Match object at 0x01E50A30>
*******
>>> s='p1234567890'
>>> re.search(r'^p(\d+){10,10}$',s)
<_sre.SRE_Match object at 0x01D69360>