optional regular expression

-]+) *@[\\w-]+ (\\.[ \\w-]+) +$ "//email address "^[a-za-z]+://(\\w+ (-\\w+) *) (\ \\w+ (-\\w+) *)) * (\\?\\s*) $ "//url "^[a-za-z0-9_]*$" The use of regular expressions in the detailed Brief introduction In short, regular expressions are a powerful tool that can be used for pattern matching and substitution. Its role is as follows: Tests a pattern of a string. For example, you can test an input string to s

. A string can be a common string or a pattern matching object. Optional limit indicates the size of the returned array. var colorText = "red,blue,yellow,black"; alert(colorText.split(",")); //[red,blue,yellow,black]alert(colorText.split(",",2)); //[red,blue]alert(colorText.split(/\W/)); //[red,blue,yellow,black] Iii. Regular Expression rules Chara

PHP regular expression syntax reprinted from: http://blog.csdn.net/kkobebryant/article/details/267527 Basic regular expression syntax First, let's take a look at two special characters: '^' and '$'. they are used to match the start and end of the string, respectively. "^ The": matches strings starting with ";"Of de

Javascript Regular Expression summary, Regular Expression Tools Regexpal is an online Javascript Regular Expression processor with address: http://www.regexpal.com Learning regular expr

Use Regular Expressions You can use regular expressions to do many things. In the following list, you can find some examples of the most common and commonly used regular expressions. ^: indicates that the text string must start with a line. Therefore, if you want to search for rows starting with "hosts", you can run the command: grep-ls '^ hosts' $

description: Pattern is a regular expression, and subject is a string to be processed. Optional matches is used to save the matching results for each sub-pattern of pattern. matches [0] stores the overall content that matches pattern, matches [1] stores the Matching content in the first parentheses in pattern, and so on.1: ); 4: $ subject = "my blog: http://www.

"\". Custom atomic tables, such as [apj] and [a-z]. common character types, such as \ d and \ D. // The following two values are equivalent, matching the email$ Mail1 = '/^ [0-9a-zA-Z] + @ [0-9a-zA-Z] + (\. [0-9a-zA-Z] +) {0, 3} $ /';$ Mail2 = '/^ \ w + @ \ w + (\. \ w +) {0, 3} $ /';?> 1.3 RMB character: a character with special meanings used to construct a regular expression. Perl can use various metacha

Regular Expression matching, replacement, search, and regular expression matching The previous article introduced the methods for matching, replacing, searching, and cutting Regular Expressions in Java. Next, I will introduce this article to you.Js

The use of regular expressions in the detailed Brief introduction In short, regular expressions are a powerful tool that can be used for pattern matching and substitution. Its role is as follows:Tests a pattern of a string. For example, you can test an input string to see if there is a phone number pattern or a credit card number pattern in the string. This is known as data validation.Replaces text. You c

1 overview A regular expression (Regular Expression) is a matching pattern that describes the characteristics of a string of text. Just as the words "tall" and "strong" in natural language are abstracted out to describe things, regular expressions are a highly abstract cha

phone number can start with 0 or not. Next, verify the 11-digit mobile phone number starting from 13. The range is [0-9] Because the 11-digit mobile phone number is available from 130-139. the number starting with 15 is not 154, so [] does not contain the number 4. Of course, it can also be written as [0-35-9]. The numbers listed in the 18 and 14 below are the same as those listed in the preceding figure. Enclosed in parentheses represents a subexpression, which contains four

contains only numbers and English, string length and between 4~16 characters Simple identification of the size of Taiwan's identity card The following code implements the code block in the text, as you can see in the cloud-dwelling community. function Codedisp ($code) { global $discuzcodes; $discuzcodes [' Pcodecount ']++; $code = Htmlspecialchars (str_replace (' \ "', '" '), Preg_replace ("/^[\n\r]*" (. +?) [\n\r]*$/is "," \\1 ", $code))); $discuzcod

Examples of Regular Expression usage in Python, python Regular Expression Regular Expressions are very useful functions in Python programming. This article will summarize common Regular Expressions for your reference. The details

Js Regular Expression basic syntax (essence), js Regular Expression 1. Regular Expression basic syntax Two special symbols '^' and '$ '. They indicate the start and end of a string respectively. Example: "^ The": indicates all str

Add 150,153,156,158,159,157,188,189 The regular expression is as follows: ^ (13 [0-9] | 15 [0 | 3 | 6 | 7 | 8 | 9] | 18 [8 | 9]) \ D {8 }$ // check whether it is composed of digits Function isdigit (s) { VaR patrn =/^ [0-9] {1, 20} $ /; If (! Patrn.exe C (s) return false Return true } // Check Logon Name: You can enter only 5-20 strings starting with a letter, which can contain numbers, "_", and ".".Functi

Of course, in order to specify a pattern, use ... This mark is not accurate enough. You need to specify exactly what character arrangement is a legitimate match. When describing a pattern, you need to use a special syntax. Here's a simple example. Regular expressions [jj]ava.+ Matches any string of the following forms: The first letter is J or J. The following three letters are AVA. The remainder of the string consists of one or more arbitrary chara