extended regular expression

Objective:The processing of logs in the server is a very common work, so operation and maintenance for a variety of text tools to view, analyze, statistics, is a necessary basic work. It is necessary to learn common file handling commands such as

Three basic Text Processing tools: grep,sed (Stream editor), awkSed:stream EDitorLine Editor: SEDFull Screen Editor: VISED: Mode spaceBy default, the file itself is not edited, only the data in the pattern space is processed, and then the pattern

First, the Linux text Lookup commandBefore talking about Linux regular expressions, there is one thing that needs to be explained in advance that there are three commands commonly used to find text files under Linux:1.grep: The oldest text-matching

http://blog.csdn.net/pipisorry/article/details/46764495MySQL Common display command1. Displays the list of databases in the current database server:mysql> SHOW DATABASES;Note: MySQL library has the MySQL system information, we change the password

Original: 53285624BrieflyLocate can quickly search the file system for a specific file. The method is to first establish an index database that includes all the file names and paths within the system, and when looking for it, simply query the index

First, the basic regular expression1. "." (one point) symbolThe dot symbol is used for u to match any character except for the line break symbol. For example: R.T can match rot, rut, but cannot match root, but if R is used. T, you can match root,

Basic usage of the Linux BOC editor sedHow to deal with SEDReads the file into memory by default----> reads conforming rows into memory that belongs to SED (the mode space of sed) for editing----> display the contents of the post-processing mode

Reference URL: http://www.runoob.com/linux/linux-command-manual.htmlwhich command:The which command is used to find and display the absolute path of a given command, and the environment variable path holds the directory that needs to be traversed

Debugging Methods for Shell scripts -N: Read the command in the script but not execute it to check for syntax errors in the script -V: Executes scripts while printing executed script commands to standard error output -X: Provides

Locate files and directories Format: locate file and directory We can see that we searched for test5 and output the result to us. We created a new file named newfile1. However, we did not find it when using locate. We may find that we use locate to

Sed and AWK getting started. Sed and AWK are text processing artifacts in * nix command lines, which are quite powerful. they are all row-oriented, or they process text in one row and one row. They read content from standard input or files and

Analyze the PHP regular expression function library. What is the PHP regular expression function library? Here we will introduce you to the PHP regular expression function library (POSIX extension) greedy Matching. we should note that what is the

Regular expressions are classified into two types: basic regular expressions (BRE) and extended regular expressions (ERE ). Metacharacters of the basic regular expression: 1 ,.: match any single character 2, []: match a single character within the

Sed and AWK getting started. Sed and AWK are text processing artifacts in * nix command lines, which are quite powerful. they are all row-oriented, or they process text in one row after another, read the content from the standard input or file,

In MySql, how does one use fuzzy search? In the Where clause, you can use the Like clause with wildcards to select columns of the datetime, char, and varchar field types... "data record. The following are wildcard characters that can be used: % zero

Use regular expression summary and regular expression summary in the database This article provides two examples to illustrate the use of regular expressions in the database. Example 1: Create function dbo. regExpTest (@ source varchar (), -- source

Mysql (6) string mode matching links: Mysql (1) mysql Installation http://www.bkjia.com/database/201210/162314.html Mysql (2) Database Operations http://www.bkjia.com/database/201210/162315.html Mysql (3) operations on Data Tables

I want to write a query statement in MYSQL to query the query statement containing % (percentage) in the name attribute in the customer table. Which of the following statements can I tell you how to write? Thank you for your urgent use !!! Example:

Mysql regular expressions I personally think that the regular expressions in other program scripts are not much different in usage and rules. Next I will summarize some of the mysql Regular Expressions and instance methods. "." Matches any single

In PHP applications, regular expressions are mainly used to:Regular match: matches the corresponding content according to the regular expressionRegular substitution: matches content according to regular expression and replacesRegular segmentation: