abababb取出两个b之间的字符：.*a(.*)a.* 输出结果: 因为从右边匹配，第一个b和第二个b直接没有东西，（.*）表示任意字符任意多个。用：.*?b(.*)b.* 输出结果为：abab 加了问号不做贪婪匹配，是从左到右找最长的子串。从做左边第一个b开始到最后一个b结束中间的字符

.*b(.+)b.* 匹配结果为：ab

abababb，匹配正则：

.*b(.{3})b. 匹配结果为：aba。

abababb，匹配正则：

.*b(.{3,})b.* 匹配结果为：abab。

import reline = "abababb"
matchObj = re.match(r'.*b(.{3,})b.*', line)if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")matchObj.group(1) :  abab

代表大于3位，小于6位  .*b(.{3,6})b.*  匹配结果为：abab。

用.*b(.{5,6})b.* 搜索输出无

import reline = "abababb"
matchObj = re.match(r'.*b(.{3,6})b.*', line)if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")matchObj.group(1) :  abab

matchObj = re.match(r'.*b(.{5,6})b.*', line)if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")No match!!

或的关系 如：^1[3456789]\d{9},以1开头第二位可以是3，4，5，6，7，8，9中任意一位，最后为9位数,

也可以用：^1[3|4|5|6|7|8|9]\d{9}

import reline = "15110154567"
matchObj = re.match(r'(^1[3456789]\d{9})', line)if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")

import reline = "15110154567"
matchObj = re.match(r'(^1[3|4|5|6|7|8|9]\d{9})', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")

15110154567

用 ^1[^3456789]\d{9} 输出为无，

用 ^1[^3|4|5|6|7|8|9]\d{9} 输出为无，

import reline = "15110154567"
matchObj = re.match(r'(^1[^3|4|5|6|7|8|9]\d{9})', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")

import reline = "15110154567"
matchObj = re.match(r'(^1[^3456789]\d{9})', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")

line = "15110154567"
matchObj = re.match(r'(^1[3456789][0-9]{9})', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))
else:print("No match!!")

import reline = ""
matchObj = re.match(r'.*', line)
if matchObj:print("matchObj.group() : ", matchObj.group())else:print("No match!!")

import reline = " " \"d1"
matchObj = re.match(r'.*?(\s+).*', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))else:print("No match!!")

import reline = " " \"d1"
matchObj = re.match(r'.*?(\S+).*', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))else:print("No match!!")

\w 匹配非特殊字符，即a-z、A-Z、0-9、_、汉字,如右边用非贪婪匹配输出为:d1z

import reline = "d1z~~~,,,^^^_ =+哈哈哈"
matchObj = re.match(r'.*?(\w+).*', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))else:print("No match!!")matchObj.group(1) :  d1z

\W 匹配特殊字符，即非字母、非数字、非汉字、非_

用非贪婪匹配输出为：  ~~~,,,^^^

import reline = "d1z~~~,,,^^^_ =+哈哈哈"
matchObj = re.match(r'.*?(\W+).*', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))else:print("No match!!")matchObj.group(1) :  ~~~,,,^^^

import reline = "d1z~~~,,,^^^_ =+哈哈哈"
matchObj = re.match(r'.*?([\u4E00-\u9FA5]+).*', line)
if matchObj:print("matchObj.group(1) : ", matchObj.group(1))else:print("No match!!")