#!/usr/bin/env python

# coding: utf-8

#copyRight by heibanke

import re

text = 'c++ python2 python3 perl ruby lua java javascript php4 php5 c'

#match,search,findall,split,sub

re.match(r'c++',text)

re.match(r'c\+\+',text)

re.match(r'java',text)

re.search(r'java',text)

print re.findall(r'python',text)

print re.split(r' perl ',text)

print re.sub(r'ruby','fortran',text)

# + 1-inf

# * 0-inf

# ? 0-1,

# [] or

# {} repeat

# [^] not

print re.findall(r'p+',text)

print re.findall(r'p[a-zA-Z]+',text) #{1,}

print re.findall(r'c[a-zA-Z]*',text) #{,inf}

print re.findall(r'c[^a-zA-Z]*',text) #{,inf}

print re.findall(r'c[a-zA-Z]?',text) #{,1}

# | or

print re.findall(r'[pj][a-zA-Z]+',text) #{,inf}

print re.findall(r'p[^0-9]+|j[a-zA-Z]+',text)

print re.findall(r'p[^0-9 ]+|j[a-zA-Z]+',text)

# ^ start

# $ end

# . except \n

print re.findall(r'^c..',text)

print re.findall(r'c+',text)

print re.findall(r'c\++',text)

print re.findall(r'c$',text)

# \w [a-zA-Z0-9_], \W

# \d [0-9], \D

# \s [ \t\n\r\f\v], \S

print re.findall(r'p\w+',text)

print re.findall(r'p\w+\d',text)

print re.findall(r'p\w+[0-9]',text)

print re.findall(r'p\w{5,9}',text)

# \b word boundary

# \B not \b

# \A input start, ^

# \Z input end, $

print re.findall(r'\bp[^0-9]',text)

print re.findall(r'p[^0-9]\b',text)

# *? 0~inf non-greedy

# +? 1~inf non-greedy

print re.findall(r'p[^0-9]*',text)

print re.findall(r'p[^0-9]*?',text)

print re.findall(r'p[^0-9]+\b',text)

print re.findall(r'p[^0-9]+?\b',text)

# () group

# (?P<name>pattern)

a=re.search(r'(p[a-zA-Z]+)([0-9])','python2')

print a.group(1), a.group(2)

a=re.search(r'(?P<name>p[a-zA-Z]+)(?P<version>[0-9])','python2')

print a.group('name'), a.group('version')

print a.groupdict()

pattern = re.compile(r'(?P<name>p[a-zA-Z]+)(?P<version>[0-9])')

results = pattern.search('python2')

print results.groupdict()

results = pattern.search('python3')

print results.groupdict()

results = pattern.search('php4')

print results.groupdict()

#########################################

for t in text.split(' '):

results = pattern.search(t)

if results:

print results.groupdict()