python re findall example

http://blog.csdn.net/pipisorry/article/details/46619179Re module matching rules see: http://blog.csdn.net/pipisorry/article/details/25909899examples of Python regular expressionsWhen log parsing, assume the given string:Char str = "10.10.1.1 [2015/04/22 +0800]/ab/cd/? test0=123test2=234 xxxx "; To get 2015/04/22,/ab/cd/, and 234 equivalents from. str = "10.10.1.1 [2015/04/22 +0800]/ab/cd/?" test0=123test2=234 xxxx "Print (Re.findall ("\d{4}/\

Today in the forum to see a question on the note down, respectively, with SED and python to write the answer, when it is the re module of the small exercise bar2014-11-05 09:39:48:ip[192.168.10.152] logid[281424076]2014-11-05 09:58:33:ip[192.168.10.152] logid[393876725]2014-11-05 09:58:33:ip[192.168.10.152] logid[393883438]2014-11-05 09:58:34:ip[192.168.10.152] logid[394052520]2014-11-05 09:58:34:ip[192.168

In the python standard libraryXML. etree. elementtreeIt is easy to use and encapsulated for XML operations. However, there are some details that need to be noticed by users:WhereXML. etree. elementtreeThe find and findall methods do not fully support XPath. Needless to say, xpath2.0 means that even xpath1.0 only supports a small part of xpath1.0. It can be said that it only supports a subset of xpath1.0.The

all string processing can be done with regular expressions. Of course, some tasks can be done with regular expressions, but the final expression becomes extraordinarily complex. In these situations, writing Python code for processing might be better; Although Python code is slower than a clever regular expression, it is easier to understand. Simple mode We will begin with the simplest form of regular exp

applicable to programming languages such as Python and Perl.MetacharactersNote: Re module In Python, we can use the built-in re module to use regular expressions. Note that regular expressions use\Escape special characters. for example, to match the string '

. So here I understand that the reason why the group does not exist is that the search and match Methods return results after matching, rather than matching all. >>> M = Re. findall ("^ A \ W +", "abcdfa \ na1b2c3", re. multiline) >>> M ['Abcdef', 'a1b2c3'] 3. metacharacters (\) and metacharacters backslash. As a string character in

This article mainly describes the Python decorator, iterator amp; Generator, re regular expression, and string formatting. if you are interested, refer to this chapter: Decorator Iterator generator Re regular expression String formatting Decorator The decorator is a well-known design model and is often used in scenarios with cut-plane requirements. it is more

Regular Expressions in python (re module) and python Regular Expressions I. Introduction Regular Expressions are a small and highly specialized programming language. In python, programmers can directly call the re module to implement regular expression matching. The regular

Brief introduction Regular Expressions (regular expression) are patterns that can match text fragments. The simplest regular expression is an ordinary string that can match itself. For example, the regular expression ' hello ' can match the string ' hello '. Note that the regular expression is not a program, but a pattern for working with strings, and if you want to use it to handle strings, you have to work with tools that support regular expressions

#., \w,\s,\d,,^,$# *,+,?, {n},{n,},{n,m}The # RE module is used for the operation of a Python regular expression.#Characters## 　　. Match any character other than line break# \w matches letters or numbers or underscores or kanji# \s matches any whitespace character# \d Matching numbers# \b Matches the beginning or end of a word# ^ matches the start of the string# $ match End of string#Views## * Repeat 0 or m

up with a non-capturing group ' (?:) '. For example, to match ' I have a dog ' or ' I have a cat ', it needs to be written R ' I have a (?:d og|cat) ', and cannot be written R ' I have a dog|cat 'Cases s = ' I had a dog, I had a cat 'Re.findall (R ' I have a (?:d og|cat) ', s)[' I have a dog ', ' I had a cat '] #正如我们所要的Let's take a look at what happens without a capturing group:Re.findall (R ' I have a dog|cat ', s)[' I have a dog ', ' cat '

characters. III. regular expressions 1. use the compile () function to compile regular expressions Because the python code is eventually translated into bytecode and then executed on the interpreter. Therefore, it is easier to execute regular expressions that are frequently used in our code for pre-compilation. Most functions in the re module have the same name and function as the methods of compiled regu

many regular expression syntax rules, far more than the above. However, we can only click here, because this blog aims to introduce the Python module and re module. The re module enables the Python language to have all the regular expression functions. The compile function generates a regular expression object based o

Python re module-Regular Expression operation, pythonre This module provides regular expression matching operations similar to Perl l. Unicode strings also apply. The regular expression uses the Backslash "\" to represent a special form or as an escape character, which conflicts with the Python syntax. Therefore, python