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Q: Under what circumstances does "pattern" match an empty string?A: Be careful to use * and as - they can match 0 times.-- 如果你打算用"%a*"匹配单词，你会发现到处都是单词。print(string.find(";$% **#$hello13""%a*")) --> 1 0print(string.find(";$% **#$hello13""%a*"6)

System version:ISO:centos-7-x86_64-everything-1511(The language of the installation is the Chinese version, the support is also good, see the help information is very convenient)[[email protected] ~]$ cat/etc/redhat-release #系统最小化安装, hereinafter

Source: http://www.ruanyifeng.com/blog/2016/01/commit_message_change_log.htmlEvery time Git commits the code, it writes a commit message (the commit), otherwise it is not allowed to commit. -m "hello world" The parameters of the above

NanyiDate: December 9, 2015I use Git every day, but I can't remember many commands.In general, the daily use of just remember 6 commands, you can. But skilled use, I am afraid to remember 60~100 a command.Here's a list of common Git commands I've

Used to generate all integers from one number to anotherGrammar:seq [Options] ... Tailseq [Options] ... First Count Mantissaseq [Options] ... First number increment MantissaParameters:-F,--format= format uses the printf-style floating-point format-S,

Awk is the report generatorAwk is the original Aho,weinberger,kernighan three initialsawk is a symbolic link pointing to gawkAWK is a separate programming language, Mode: Similar address delimitation $ A represents an entire line $1$

Guava Learning notes: manipulating strings in guavaReprint: Http://outofmemory.cn/java/guava/base/StringsIn Google Guava, it provides a great convenience for string manipulation, with an established judgment string whether it is an empty string or

The SEQ command prints a sequence of numbers.Seq-print a sequence of numbersSynopsisseq [OPTION] ... Lastseq [OPTION] ... First Lastseq [OPTION] ... First INCREMENT LastDESCRIPTIONPrint numbers from first to last, in steps of

Awk Report GeneratorI. awk concepts and use of formatsAwk is a powerful report generator, awk itself has the ability to traverse, support the conditional loop, is a programming language, awk output 1, the Print command followed by the items are

This article summarizes seven common php print output functions, echo, print, printf, sprintf, print_r, var_dump, die, I hope this article will help you with php learning. I will summarize seven common php print output functions, echo, print, printf,

: This article describes how many years, months, and days are separated by two dates in php. For more information about PHP tutorials, see. The first method is implemented using the PHP class library. /*** Function: calculate the number of years,

Interval between date_diff calculation & quot; operation time & quot; and & quot; current time & quot; Function get_Pass_Date ($ ymdhms1, $ ymdhms2) {$ datetime1 = date_create ("$ hour"); $ datetime2 = date_create ("$ ymdhms2"); $ interval =

Dictionary: an object associated with an array or a hash list that can be indexed by a keyword. Usage: defines an object that can contain multiple named fields, it can also be used as a container dictionary to quickly search for unordered data. it

This is a creation in Article, where the information may have evolved or changed. Composite data that is understood by the individual is compounded by other data formats. 1. Array The type format of an array is a single data cell type + length

In the development of C + + programs, generally in the throughput, concurrency, real-time high requirements. When designing a C + + program, the following points can be summed up to improve efficiency: Concurrent Asynchronous Cache

Recently and the project members have agreed to git commit rules, but the Convention is agreed to, to ensure that everyone is executed, or need to do some verification work procedures. The general agreement is as follows: Comment Format: : #69 fix

Convert #region DataTable to JSON string instance methodSummary description of GETCLASSTYPEJOSNpublic class Getclasstypejosn:ihttphandler{File name: DataTable and JSON string mutual transferAll rights reserved: Copyright (C) Create Family Wealth

 ―――――――――――――――――――――CString header file #include String header file #include 1. CString turn char *CString CStr;Char *p = (LPSTR) (LPCTSTR) CStr;2. string Turn CStringCstring.format ("%s", String.c_str ());Using c_str () is really better than

Similar to the example above, Google's keyword search rankings can be obtained by ' http://clients1.google.cn/complete/search?&q= ' + ' keywords '.I use the Delphi keyword to get the result is: Window.google.ac.h ([" Delphi", [ ["Delphi

In this paper, a simple analysis of a function commonly used in FFmpeg: Avformat_alloc_output_context2 (). In a ffmpeg-based AV encoder program, this function is usually the first called function (except for the component registration function