Category：Regular Expression
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Time：2020-4-2
As we all know, in the process of program development, it is inevitable to encounter the situations that need to match, find, replace and judge strings, and these situations are sometimes more complex. If we use pure coding method to solve these problems, it will often waste the time and energy of programmers. Therefore, learning […]
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Time：2020-4-1
1： Capture email address in web page Using regular expressions to match text in web pages Copy codeThe code is as follows: [\\w[.-]][email protected][\\w[.-]]+\\.[\\w]+ Split and extract web content import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.regex.Matcher; import java.util.regex.Pattern; public class EmailSpider { public static void main(String[] args) { try { BufferedReader br = […]
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Time：2020-3-31
Next, I will introduce the principle of regular expression substitution through illustration and text. See the following for details. I. opening Recently, replacement is often used, so I will come out to sort out. What I want to share here is the replacement principle in regular expressions. The first thing I want to declare is […]
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Time：2020-3-30
What is regular expression In computer science, regular expression refers to a single string used to describe or match a series of strings that conform to a certain syntactic rule. In many text editors or other tools, regular expressions are often used to retrieve and / or replace text content that conforms to a certain […]
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Time：2020-3-29
Match () and search () are regular matching functions in Python. What’s the difference between these two functions? The match() function only detects whether re matches at the beginning of a string. Search() scans the entire string to find a match. That is to say, match() returns only if it matches successfully at position 0. […]
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Time：2020-3-28
Python has added re module since version 1.5, which provides Perl style regular expression mode. Python before 1.5 provides Emacs style patterns through the regex module. Emacs style mode is a little less readable and has no strong function, so try not to use the regex module when writing new code. Of course, occasionally you […]
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Time：2020-3-27
1、 Check the expression of a number 1 digit: ^ [0-9]*$ 2 n digits: ^ \ D {n}$ 3 at least n digits: ^ \ D {n,}$ 4 M-N digits: ^ \ D {m, n}$ 5 zero and non-zero digits: ^ (0| [1-9] [0-9] *)$ 6 the number with two decimals at most at the […]
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Time：2020-3-26
Since I need to use the test data in the asp.net MVC 3 imitating the enterprise system of the blog Park, I’m too tired to input myself, so I grabbed some list data of the blog park. Please don’t be surprised. Regular expressions are used to capture blog Garden data, so friends who are not […]
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Time：2020-3-25
Original symbol Because? Has a special meaning in regular expressions, if you want to match? Itself, you need to escape, \? Quantifiers The question mark can represent 0 times or one time of repeating the previous content, that is, either it does not appear or it appears once. Non greedy matching Greedy matching When matching […]
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Time：2020-3-24
I. test environment Operating system red hat as 5.5 Database Sqlserver2000 installed in Windows XP Professional, I assume that the password of the database user is autotest, and the database file is atsdb Note: MS has never provided SQL server for Linux, so you should not try to install SQL Server in Linux system, but […]
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Time：2020-3-23
The following UPDATE statement executes to replace test in www.test.com with ABC Program code Example sentence: Update test SET url= REPLACE(‘www.test.com’,’test’, ‘abc’ ) Where url REGEXP www.test.com; If in the record, there are similar www.test.com www.test1.com www.test2.com To change these records to www.abc.com, execute the SQL statement as follows Update test SET url= REPLACE(‘www.test.com’,’test’, ‘abc’ […]
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Time：2020-3-22
In the past, I used like to search data. Later, I found that there are regular expressions in MySQL and the performance is better than like. Let me share with you the details of using MySQL regexp regular expressions. I hope this method can help you. MySQL is implemented with the regular expression of Henry […]
