try python’s re module . sorry the code is written in python2.7
from re import findall
listOfStrings=['asjkf1234alksfl293487293084','9832alkdjsf03940930i2304093','9lads92387498327409']
for v in listOfStrings:
res=findall(r'\d+',v)
print res[0]
8
solved python Read N integers until first character