python3.x正则表达式的含义及使用

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u014727529/article/details/78793758

import re
import nltk


#正则表达式
wordlist = [w for w in nltk.corpus.words.words('en') if w.islower()]
print(wordlist)
#查找ed结尾的词汇
print([w for w in wordlist if re.search('ed$', w)])
#匹配：8个字母，第3个字母是j，第6个字母是t
print([w for w in wordlist if re.search('^..j..t..$', w)])
#9宫格输入判断
print([w for w in wordlist if re.search('^[ghi][mno][jlk][def]$', w)])


#正则表达式中的+
chat_words = sorted(set(w for w in nltk.corpus.nps_chat.words()))
print([w for w in chat_words if re.search('^m+i+n+e+$', w)])
print([w for w in chat_words if re.search('^[ha]+$', w)])
wsj = sorted(set(nltk.corpus.treebank.words()))
print([w for w in wsj if re.search('^[0-9]+\.[0-9]+$', w)])
print([w for w in wsj if re.search(r'^[A-Z]+\$$', w)])
print([w for w in wsj if re.search('^[0-9]{4}$', w)])
print([w for w in wsj if re.search('^[0-9]+-[a-z]{3,5}$', w)])
print([w for w in wsj if re.search('^[a-z]{5,}-[a-z]{2,3}-[a-z]{,6}$', w)])

print([w for w in wsj if re.search('(ed|ing)$', w)])