re正则表达式公式讲解3
1.分组匹配 用()把需要分组的类型括起来,如下
import re
m = re.search("([a-z]+)([0-9]+)","alex123")
print(m.groups()) #用groups() 涉及到分组就用groups
# ('alex', '123')
2.”\A“ 表示从头开始匹配,和”^“ match 类似
“\Z” 匹配字符结尾,同$
“\d” 相当于数字0-9
import re
m = re.search("([a-z]+)([\d]+)","alex123")
print(m.groups())
('alex', '123')
“\D” 匹配非数字
import re
m = re.findall("\D","alex%467*123")
print(m)
# ['a', 'l', 'e', 'x', '%', '*']
“\w” 匹配(a-z A-Z 0-9)
import re
m = re.findall("\w","alex%467*123")
print(m)
# ['a', 'l', 'e', 'x', '4', '6', '7', '1', '2', '3']
“\W” 匹配非(a-z A-Z 0-9)
import re
m = re.findall("\W","alex%467*123")
print(m)
# ['%', '*']
“\s” 匹配空白字符
import re
m = re.findall("\s","ale\nx%46\t7*123")
print(m)
# ['\n', '\t']
“(?P<name>...)” 分组匹配 分组之间不需要加逗号,加了会报错。
import re
s = "321324199309187654"
m = re.search("(?P<convince>\d{3})""(?P<city>\d{3})""(?P<year>\d{4})""(?P<month>\d{4})",s)
print(m.groups())
# ('321', '324', '1993', '0918')
调用groupdict,生成字典。
import re
s = "321324199309187654"
m = re.search("(?P<convince>\d{3})""(?P<city>\d{3})""(?P<year>\d{4})""(?P<month>\d{4})",s)
print(m.groups())
print(dir(m))
print(m.groupdict())
# {'convince': '321', 'city': '324', 'year': '1993', 'month': '0918'}
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