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Python code:

>>> STR
'AT005CC56'
>>> m = re.findall('[0-9]+',STR)
>>> m[0]=(int(m[0])+1).__str__().rjust(3, '0')
>>> s = re.sub(re.findall('[0-9]+',STR)[0], m[0], STR)
'AT006CC56'



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Python code:
import re
a = 'AT005CC56'
reg = re.compile(r'AT(\d+?)[^\d]+?\d*')
match = reg.search(a)
if match is not None:
num = match.groups()[0]
format = 'AT%' + '0%dd' % len(num)
a = reg.sub(format % (int(num)+1), a)

print a


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Python code:
import re
a = 'AT005CC56'
reg = re.compile(r'AT(\d+?)[^\d]+?.*')
match = reg.search(a)
if match is not None:
num = match.groups()[0]
format = '%' + '0%dd' % len(num)
a= a.replace(num, format % (int(num)+1))

print a



import re
stram='abc12def000007bcdAB005ABC62b'
fi=re.findall(r'[0-9]+',stram)
for e


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