python正则表达式

最新推荐文章于 2025-11-26 15:40:52 发布

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#python #正则表达式

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本文介绍了一个使用Python进行文件读写及正则表达式匹配的示例程序。该程序从'a.txt'中查找特定模式（以&Rplace开头的内容）并将其写入'b.txt'。文中展示了两种不同的读取方式：逐行读取与一次性读取整个文件。

import os
import re
stext=[]
def gettext():
	with open('a.txt','r+') as fileone:
		for line in fileone.readlines():
			line = line.strip()
			if not line:
				continue
			pattern = re.compile(r'"Rplace[^"]+')		#同findtext = re.findall(r'"Rplace[^"]+',line)
			findtext = re.findall(pattern,line)
			with open('b.txt','a+') as fileone:
				fileone.writelines(line+'"\n' for line in findtext)
if __name__ == '__main__':
	gettext()
	os.system('pause')
	
	
import os
import re
stext=[]def gettext():
	with open('a.txt','r+') as fileone:
		temp =fileone.read()
		pattern = re.compile(r'"Rplace[^"]+') #同findtext = re.findall(r'"Rplace[^"]+',temp)
		findtext = re.findall(pattern,temp)
	 	with open('b.txt','a+') as fileone:
			fileone.writelines(line+'"\n' for line in findtext)
 if __name__ == '__main__':
	gettext()