使用python正则表达式查找重复表达式

发布于 2024-11-09 06:28:29 字数 260 浏览 0 评论 0原文

您好，我正在尝试从文件中检索以下字符串。

neighbors= {5 7 9 11 13 14 15 16 17 }

模式 {number1 number2... } 各不相同，有些很短，有些太长。我想找到这样的模式。我的逻辑是检索语句 "neighbors= {" ，后面跟着一个数字和一个空格作为重复，直到程序找到最后一个右大括号。有人可以帮我解决语法问题吗？

谢谢

原文

Hello I am trying to retrieve the following string from a file

neighbors= {5 7 9 11 13 14 15 16 17 }

The pattern {number1 number2... } varies, some are short some are too long. I want to find such a pattern. My logic is to retrieve the statement "neighbors= {" which is followed by a number and a space as a repetition till the program finds the last closed braces. Can some one help me out with the syntax?

Thanks

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傲世九天 2024-11-16 06:28:29

我想你正在寻找这个：

import re
FOO = """neighbors= {5 7 9 11 13 14 15 16 17 }"""
match = re.search('(neighbors\s*=\s*\{\s*(\d+\s*)+\})', FOO)
print match.group(1)

正则表达式是可移植的，当然可以移植到许多不同的语言。

运行会产生...

neighbors= {5 7 9 11 13 14 15 16 17 }

但是正则表达式将匹配大括号中的任意数量的数字。

编辑

用 re.findall() 和 re.compile() 进行说明...

import re
FOO = """neighbors= {5 7 9 11 13 14 15 16 17 }"""
COMPILE = re.compile('(neighbors\s*=\s*\{\s*(\d+\s*)+\})')
match = re.findall(COMPILE, FOO)
print match[0]

运行第二个代码返回...

neighbors= {5 7 9 11 13 14 15 16 17 }

尽管您应该记住 .findall( ) 用于在目标字符串中多次出现正则表达式匹配。提供的示例并未说明需要 .findall()

I think you're looking for this:

import re
FOO = """neighbors= {5 7 9 11 13 14 15 16 17 }"""
match = re.search('(neighbors\s*=\s*\{\s*(\d+\s*)+\})', FOO)
print match.group(1)

The regex is portable, of-course to many different languages.

Running that yields...

neighbors= {5 7 9 11 13 14 15 16 17 }

But the regex will match an arbitrary number of digits in curly-braces.

EDIT

Illustrating with re.findall() and re.compile()...

import re
FOO = """neighbors= {5 7 9 11 13 14 15 16 17 }"""
COMPILE = re.compile('(neighbors\s*=\s*\{\s*(\d+\s*)+\})')
match = re.findall(COMPILE, FOO)
print match[0]

Running the second code returns...

neighbors= {5 7 9 11 13 14 15 16 17 }

Although you should remember that .findall() was meant for multiple occurrences of the regex match inside a target string. The examples provided have not illustrated a need for .findall()

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