#!/usr/bin/python
# -*- coding: utf-8 -*-
import re

f = open('PB_Backup.vcf')
contents = f.read()
f.close()

def replace_phones(matchobj):
    return matchobj.group('begin')+matchobj.group('number')[1:]+matchobj.group('end')

regex = ur'(?P<begin>TEL.+:)(?P<number>\d{11})(?P<end>.+)'

output = re.sub(regex, replace_phones, contents)

f = open('PB_Result.vcf', 'wb')
f.write(output)
f.close()