perl escape single quote in string

About the origins and characteristics of Perl and Python Perl is the abbreviation of practical extraction and report Language, created by Larry Wall in 1987, originally designed to facilitate the processing of reports on UNIX, and has become a fully

1 All numbers in Perl have the same internal format, only double-precision floating-point numbers (there is no integer value inside perl). 2 Perl allows the use of underscores to delimit longer integers, such as 612980400283768 and 612_980_400_283_76

Reference: http://shouce.jb51.net/perl5/Web site environment configuration: http://www.jb51.net/article/74005.htm The basic syntax of Perl http://www.jb51.net/shouce/Perl.htm Preface: What is Perl, and what is it used for? Perl's original designer'

1. Simple Variables ============== 1. Integer$ X = 123456;Perl stores integer data in floating-point registers. In fact, integer variables are treated as floating-point numbers in Perl, but they are only a special column of floating-point data.The

1.Perl Array (1): 1 Initialize the array @array = ("Stringa", "StringB", "STRINGC");(2) using negative index loop to retrieve print $array [-1]; #输出索引为 (-1 + 3)% 3 = 2 STRINGC3 Dynamic growth $array [4] = "STRINGD"; #虽然 $array [3] has not yet been

In a string, some sequences have special meanings. These sequences start with a backslash ('\').Escape characters. MySQL recognizes the following escape sequence: \ 0 ASCII 0 (NUL) characters. \' Single quotes (''').

In a string, if a sequence has a special meaning, each sequence starts with a backslash ("\") and is called an escape character.MySQL recognizes the following escape characters:\ 0 is an ASCII 0 (NUL) character.\ 'One ASCII 39 single quotes ('')

A string of strings consists of a series of characters, each of which is equal to one byte. This means that PHP can only support a 256 character set and therefore does not support Unicode. See detailed string types. The note:string can reach 2GB

1) is the URL Legal:/^ (http: \/| https :\/\/)? ((? : [A-Za-z0-9] +-[A-Za-z0-9] + | [A-Za-z0-9] +) \.) + ([A-Za-z0-9] + )[\/\? \:]?. * $/ 2) When to escape: 1. For example, if you want to use "in" ", then \"; 2. Some special characters 3) database

A string in PHP can be defined in the following four methods:Single quotesDouble quotation marksHeredoc syntax structureNowdoc syntax structure (since PHP 5.3.0 and later)Single quotesThe simplest way to define a string is to enclose it with single