re库主要功能函数

#coding=utf-8import re#re.search(pattern, string, flags)匹配正则表达式的第一个位置，返回match对象match = re.search(r'[1-9]\d{5}', 'BIT 100081')if match:    print match.group(0)#re.match(pattern, string, flags)从字符串的开始位置匹配正则表达式，返回match对象#不调整参数时会报错#match = re.match(r'[1-9]\d{5}', 'BIT 100081')#调整参数match = re.match(r'[1-9]\d{5}', '100081BIT')if match:    print match.group(0)#报错# print match.group(0)# Traceback (most recent call last):#   File "C:/Users/Administrator/PythonWorkSpace/python14.py", line 10, in <module>#     print match.group(0)# AttributeError100081# : 'NoneType' object has no attribute 'group'#re.findall(pattern, string, flags)以列表类型返回全部能匹配的子串ls = re.findall(r'[1-9]\d{5}', 'BIT100081 TSU100084')print ls#re.split(pattern, string, maxsplit, flags)将字符串按照正则表达式匹配结果进行分割，返回列表类型#maxsplit:最大分割数ls = re.split(r'[1-9]\d{5}', 'BIT100081 TSU100084')print lsls = re.split(r'[1-9]\d{5}', 'BIT100081 TSU100084', 1)print ls #只匹配第一个#re.finditer(pattern, string, flags)返回一个匹配结果的迭代类型，每个迭代元素都是match对象for m in re.finditer(r'[1-9]\d{5}', 'BIT100081 TSU100084'):    if m:        print m.group(0)#re.sub(pattern, repl, string,count=0, flags=0)在一个字符串中替换所有匹配正则表达式的子串，返回替换后的字符串#repl:替换匹配字符串的字符串#count：匹配的最大替换次数print re.sub(r'[1-9]\d{5}', ':zipcode', 'BIT100081 TSU100084')print re.sub(r'[1-9]\d{5}', ':zipcode', 'BIT100081 TSU100084', 1)