python re示例

#!/usr/bin/env python 
# encoding: utf-8  
# Date: 2018/5/25
import re

s = '124311200111155214'
ss = re.search('(?P<province>d{3})(?P<city>d{3})(?P<born_year>d{4})',s).groups()
print(ss) # ('124', '311', '2001')
ss1 = re.search('(?P<province>d{3})(?P<city>d{3})(?P<born_year>d{4})',s)
print(ss1.groupdict()) # {'province': '124', 'city': '311', 'born_year': '2001'}

# split
s_sp = 'alex22jack23rain31jinxin50'
s_sp1 = re.split('d',s_sp)
print(s_sp1) # ['alex', '', 'jack', '', 'rain', '', 'jinxin', '', '']

s_sp2 = re.split('d+',s_sp)
print(s_sp2) #['alex', 'jack', 'rain', 'jinxin', '']
s_sp3 = re.findall('d+',s_sp)
print(s_sp3) #['22', '23', '31', '50']

s3 = 'alex22jack23rain31jinxin50#mack-oldboy'
s31 = re.split('d+|#|-',s3)
print(s31) # ['alex', 'jack', 'rain', 'jinxin', '', 'mack', 'oldboy']

s4 = 'alex22jack23rain31jinxin50|mack-oldboy'
s41 = re.split('d+|||-',s4)
print(s41) # ['alex', 'jack', 'rain', 'jinxin', '', 'mack', 'oldboy']

s5 = 'sss\123'
s51 = re.split('\\',s5)
print(s51)  # ['sss', '123']

# sub 替换
s6 = 'alex22jack23rain31jinxin50|mack-oldboy'
s61 = re.sub('d+', '_', s6)
print(s61)  #  alex_jack_rain_jinxin_|mack-oldboy
s62 = re.sub('d+', '_', s6, count=2)
print(s62)  # alex_jack_rain31jinxin50|mack-oldboy

s7 = '9-2*5/3+7/3*99/4*2998+10*568/14'
s71 = re.split('[-*/+]', s7)
print(s71)  # ['9', '2', '5', '3', '7', '3', '99', '4', '2998', '10', '568', '14']

s72 = re.split('[-*/+]', s7, maxsplit=2)
print(s72)  # ['9', '2', '5/3+7/3*99/4*2998+10*568/14']

# fullmatch compile   compile为了提高效率
pattern = re.compile('w+@w+.(com|cn|edu)')
print(pattern.fullmatch('alex@oldboyedu.cn'))  # <_sre.SRE_Match object; span=(0, 17), match='alex@oldboyedu.cn'>

# 计算器
s8 = '1-2*((60-30+(-40/5)*(9-2*5/3 + 7/3*99/4*2998 + 10*568/14)) - (-4*3)/(16-3*2))'

s81 = re.search('([^()]+)', s8)
print(s81)  # <_sre.SRE_Match object; span=(12, 19), match='(-40/5)'>
s82 = re.findall('([^()]+)', s8)
print(s82)  # ['(-40/5)', '(9-2*5/3 + 7/3*99/4*2998 + 10*568/14)', '(-4*3)', '(16-3*2)']