python regular expression findall

Regular expression for beginners, to use this function is still a bit difficult, but also read a long time to master some of the foundation of the book and practice. Some of the things learned are better to write down, lest a few days and forget. Common symbols:. * ? ()Common methods: FindAll Search SubCommon skills1 basic usage of

match (), search (), sub (), Subn (), Split (), FindAll (), etc.Re.sub (Pattern, REPL, String):Given a regular expression pattern, it acts on a string string and modifies the matching content to Replsuch as: Re.sub (R ' w...d ', ' python ', ' Hello World '), this sentence will be implemented to modify Hello world to H

() #4print Match.end () #7#findall返回的是列表Match=re.findall (R ' Dog ', ' dog Cat Dog ') #匹配是整个字符串, each substring to match, matched to the string culling, followed by the string to continue to match the regular condition until the end of the string, how many matches how many print match #[' Dog ', ' dog ']#使用 Mathch.group grouping uses (), grouping and non-grouping matching "Large substrings" are the

The common methods of the RE module are:Re.findall () Returns a list of all strings that can be matched by a regular expression in a string.Usage Re.findall (regular expression, string).S1 = "Sadjhjafdsajkhjsdaysadsadduayu"For example, if you want to match a string from the long string above, the one that has a charact

m:' ['+ m. group (0) + ']', text, 0); replace the space ''In the string with '[]'.Re. splitYou can use re. split to split a string, such as re. split (r '\ s +', text). The string is split into a word list by space.Re. findallRe. findall can obtain all matching strings in the string. For example, re. findall (R' \ w * oo \ w * ', text); obtains all words containing 'oo' in a string.Re. compileYou can compi

that contain some special characters, as follows:pattern="^[A-Za-z0-9\.\+_-][emailprotected][A-Za-z0-9\._-]+\.[a-zA-Z]*$"In addition to the email address, we often need to determine such as phone number, IP address and so on, as follows:IP Addressip="^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$"Phone number="'(\d{3}[-\.\s]??\d{3}[-\.\s]??\d{4}|\(\d{3}\)\s*\d{3}[-\.\s]??\d{4}|\d{3}[-\.\s]??\d{4})'"There is also the possibility that you need to go to a URL link in the crawler, as follows:url='http[s]?://

Unicode () function to convert it. If you know the encoding of the source string, you can use newstr = Unicode (oldstring, original_coding_name) to convert it. For example, Unicode (string, "utf8") is commonly used in Linux "), cp936 may be used in windows, but it is not tested.Example Program Copy code The Code is as follows :#! /Usr/bin/Python #-*-Coding: UTF-8 -*- # # Author: Rex # Blog: http://iregex.org # Filename py_utf8_unicode.py # Created

Python has added the RE module since version 1.5, which provides a Perl-style regular expression pattern. Prior to Python version 1.5, the Emecs style mode was provided through the Regex module. Emacs style mode is less readable and functionally weak, so try not to use the Regex module when writing new code, but occasi

Learn a python Regular expression for match,search,findall, A brief summary of Finditer and other functionsHere is an example of a python Regular expression using a Web page:strhtml =

pattern match, the regular expression in Python is greedy pattern matching, it will meet the requirements of the entire expression, as much as possible to match the characters, the concrete effect is shown in the following example2.4 borders Grammar Description Pattern Example Match

unicode () function to convert it. If you know the encoding of the source string, you can use newstr = unicode (oldstring, original_coding_name) to convert it. For example, unicode (string, "utf8") is commonly used in linux "), cp936 may be used in windows, but it is not tested.Example ProgramCopy codeThe Code is as follows:#! /Usr/bin/python#-*-Coding: UTF-8 -*-## Author: rex# Blog: http://iregex.org# Filename py_utf8_unicode.py# Created:Import reDe

set: [ABC]; [A-z]-Metacharacters do not work in character sets: "akm$"-complement matches characters that are not within range: "^5"Example:>>> import re# in Python If you want to use regular expressions, you need to import the RE module, there are many methods in the RE module # Defining a regular expression is actua

Python regular expression to obtain, filter, or replace HTML tags. python labels This article introduces several methods for getting, filtering, or replacing HTML tags using regular expressions in Python. The specific content is a

, string, flags=0) Scans the entire string and returns the first successful match re.sub(pattern, repl, string, count=0) Used to replace a match in a string, Repl: A replacement string, or a function re.compile(pattern[, flags]) Used to compile a regular expression to generate a regular

Data crawling allows you to write less than 1000 lines of code! | Python regular expression, 1000 rows of python BytesSpring flowers bloom, and it's a good season to go out and play! When it comes to photography, do you have a picture? It is to process the relationship between people, scenes, and things in a limited sp

Python -- Regular Expression (3) 4. More powerful functions So far, we have learned part of the regular expression. In this section, we will introduce some new metacharacters and how to use groups to retrieve some matched texts. Certificate ----------------------------------

A regular expression is a special sequence of characters that can help you easily check whether a string matches a pattern.Python has added the RE module since version 1.5, which provides a Perl-style regular expression pattern.The RE module enables the Python language to ha

specified string must be worn now beginning/end Example: Import Rema = Re.match (R ' ^[\w]{4,10}@163.com$ ', '[email protected]') print ma.group () ma = Re.match (R ' \aimooc[\w]* ', ' Imooc python ') print Ma.group ()Group Matching Character The | Match one or both of the expressions (AB) Bracket expression as a grouping

What is capture? After a subexpression is specified using parentheses, the text that matches the subexpression (that is, the matching content) can be used in the expression or other processes, the following article mainly introduces the capture-related information in the Python regular expression. For more information,

Three things ordinary people do not understand: The doctor's prescription, Taoist Ghost, programmer get regular expression What is a regular expression? Regular expressions, also known as regular expressions, are called