regular expression for email validation

() Check = true; Return check; Email verification: Any digit in front of a non-null character must contain @, followed by. com or. cn Matching formula: \ W + @ \ W + \. (COM) | (CN) [Java] View plaincopy Boolean check = false; String RegEx = "\ W + @ \ W + \. (COM) | (CN )"; String input = "19100390888 "; Pattern pattern = pattern. Compile (RegEx) // compile the Regular

the next version of the email address check function? The second function shown above uses only regular expressions, including a call to the Ereg function. The Ereg function returns TRUE or FALSE to declare whether its string argument matches the regular expression. Many programmers avoid

name is the same, but to remove the underline: ^[a-z0-9-]+ (\.[ a-z0-9-]+) *$ Good. Now just use the "@" to connect the two parts: ^[_a-z0-9-]+ (\.[ _a-z0-9-]+) *@[a-z0-9-]+ (\.[ a-z0-9-]+) *$ This is the complete email authentication matching mode, only need to call: Eregi ("^[_a-z0-9-]+" (\.[ _a-z0-9-]+) *@[a-z0-9-]+ (\.[ a-z0-9-]+) *$ ", $eamil) We can get an email. Other uses of

The regular expression is not a programming language, and there is no function of computing and dealing with problems, it is a single string that describes or matches a series of strings that conform to a certain syntactic rule.Examples of regular expression applications: Prevent SQL injection: Especially for

This regular expression that matches the URL address is a regular expression that we specifically write to filter the external URL address in the post to match all URL addresses. is a strong regular expression that passes through

When programmers write code without having to deal with strings and "queries," There is a thing called regular expression in the intersection of the two, and this guy can improve programming efficiency with bad words ... You can go and learn a lesson first. For a simple example of regular use: Copy Code code as follows: var m = Location.href.mat

n times 36 */37 System. out. println ("carsdff ". matches ("\ w *"); 38 System. out. println ("teacher ". matches ("\ w +"); 39 System. out. println ("abcq ". matches ("\ w {3}"); 40 System. out. println ("=========================="); 41 System. out. println ("I am here ". matches ("I \ B \ bam \ B \ bhere"); 42 System. out. println ("". matches (". "); 43} 44} Sample Code (/Email Detection): 1 package com. ibeifeng. regex; 2 public class RegexDemo3

The regular expressions currently used are as follows: Copy Code code as follows: (? =.*\d) (? =.*[a-za-z]) (? =.*[^a-za-z0-9]). {8,30} The corresponding validation rule is that the password must contain letters, numbers, special characters, at least 8 characters, and a maximum of 30 characters. This regular

backslash (). The escape sequence for tabs is: T. So if we're going to detect whether a string starts with tabs, you can use this pattern: ^t Similarly, a "new row" is represented by N, and R represents a carriage return. Other special symbols, which can be preceded by a backslash, such as the backslash itself with the expression, the period. 2. Character clusters In programs on the Internet, regular e