正则表达式（1）

import retext = "Hi,I am Shirley Hilton.I am his wife."m = re.findall(r"hi",text)m = re.findall(r"\bhi\b",text)if m:   print melse:    print 'not match'

 

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正则表达式（2）

import retext = "Hi,I am Shirley Hilton.I am his wife."m = re.findall(r"hi",text)m = re.findall(r"\bhi\b",text)m = re.findall("[Hh]i",text)m = re.findall("hi",text)m = re.findall("\bhi\b",text)m = re.findall(r"[Hh]i",text)if m:   print melse:    print 'not match'

print  "\bhi"print  r"\bhi"print "\\bhi"

import retext = "Hi,I am Shirley Hilton.I am his wife."m = re.findall("i.",text)m = re.findall(".",text)m = re.findall("I.*e",text)   #贪婪匹配#m = re.findall("I.*?e",text)  #懒惰匹配if m:    print melse:    print 'not match'

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正则表达式（3）

 

最后留一道习题：

 

从下面一段文本中，匹配出所有s开头，e结尾的单词。

 

site sea sue sweet see case sse ssee loses

 

import retext = "site sea sue sweet see case sse ssee loses"m = re.findall(r"\bs\S*?e\b",text)  #不包括空白字符m = re.findall("\bs\S.*?e\b",text)m = re.findall(r"\bs.*?e\b",text)m = re.findall("\bs.*?e\b",text)if m:    print melse:    print 'not match'

 

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正则表达式（4）