1.3.6 匹配多个字符串(2018-05-08) 我们在正则表达式 bat|bet|bit 中使用了择一匹配(|)符号.如下为在 Python中使用正则表达式的方法. import re #bat|bet|bit 中使用了择一匹配(|)符号 bt = 'bat|bet|bit' # 正则表达式模式: bat. bet.bit m = re.match(bt,'bat') # 'bat' 是一个匹配 if m is not None: print(m.group()) print("match
python贪婪和非贪婪 正则表达式通常用于在文本中查找匹配的字符串.Python里数量词默认是贪婪的(在少数语言里也可能是默认非贪婪),总是尝试匹配尽可能多的字符:非贪婪则相反,总是尝试匹配尽可能少的字符.在"*","?","+","{m,n}"后面加上?,使贪婪变成非贪婪. >>> s="This is a number 234-235-22-423" >>> r
re.match只匹配字符串的开始,如果字符串开始不符合正则表达式,则匹配失败,函数返回None:而re.search匹配整个字符串,直到找到一个匹配. #!/usr/bin/python import re line = "Cats are smarter than dogs"; matchObj = re.match( r'dogs', line, re.M|re.I) if matchObj: print "match --> matchObj.group() :
经过2天的长时间的战斗,python计算器终于完成了. import re val="1-2*((60-30*(9-2*5/3+7/3*99/4*2998+10*568/14))-(-4*3)/(16-3*2))" def chen(arg): f = arg # print (f) if "*" in arg or "/" in arg: '''如果包含*号或者除好则进如该方法''' b2_2 = re.search("\d+\.?\
Marriage Match II Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1608 Accepted Submission(s): 566 Problem Description Presumably, you all have known the question of stable marriage match. A