email validation in java without regular expression

The domain name format is as follows:A domain name is composed of a specific character set, English letters, numbers, and "-" (that is, a hyphen or minus sign) of Chinese Characters in different countries, but cannot start or end with "-". "-" cannot appear consecutively. The domain name is case-insensitive. The domain name can contain up to 60 bytes (including the suffix. com,. net, and. org )./^ [A-z] ([a-z0-9] * [-_]? [A-z0-9] +) * @ ([a-z0-9] * [-_]? [A-z0-9] +) + [\.] [a-z] {2, 3} ([\.] [a-

If the user enters the HTTP://AAA.BBB.CCC The following code converts his input into a HTTP://AAA.BBB.CCC We look at the regular expression of how powerful, hehe. ' Call this function to display as a super join Response.Write to_html (S_message) %> Function to_html (s_string) to_html = Replace (s_string, "" "", "" ") to_html = Replace (to_html, "to_html = Replace (to_html, ">", ">") to_html = Replace (to

Detection phone Number:/0? (13|14|15|18) [0-9] {9}/Detect user name: (number, English, kanji, underline, middle line):/^[a-za-z0-9_\-\u4e00-\u9fa5]+$/Password: (digital, English, underline, horizontal line)/^[a-za-z0-9_-]+$/ID:/\d{17}[\d|x]|\d{15}/Non-null:/^\s+$/IP address:/(?:(? : 25[0-5]|2[0-4]\d| [01]?\d?\d] \.) {3} (?: 25[0-5]|2[0-4]\d| [01]?\d?\d])/JS Regular expression is still very important, there

I. Related code1 function test ()2 {3 var temp = document. getElementById ("text1 ");4 // email Verification5 var myreg =/^ ([a-zA-Z0-9] + [_ | \.]?) * [A-zA-Z0-9] + @ ([a-zA-Z0-9] + [_ | \.]?) * [A-zA-Z0-9] + \. [a-zA-Z] {2, 3} $ /;6 if (! Myreg. test (temp. value ))7 {8 alert ('prompt \ n please enter a valid E_mail! ');9 myreg. focus ();10 return false;11}12}13 // because the methods are the same, write only the relevant

Requirements:(1) email prefix rules:A string of 26 English letters, 10 Arabic numerals, dots, minus signs, or underscores. It can only start and end with a number or letter.(2) domain name naming rules:It consists of 26 English letters, 10 Arabic numerals, and minus signs. It can only start and end with a number or letter and cannot exceed 63 characters in total.(3) case insensitive. Expression: ^ (?! (\.

Using system;using system.collections.generic;using system.componentmodel;using system.data;using System.Drawing; Using system.linq;using system.text;using system.threading.tasks;using system.windows.forms;using System.text.regularexpressions;namespace idcard{ Public partial class form1:form { nbsp Public Form1 () { Initializecompon ENT (); } private void button1_click (object sender, EventArgs E ) { //reference: Http://baike.baidu.com/item/%E8%BA%AB %e4%bb%bd%e8%af%81

Script Language = " Javascript " > VaR Patterns = New Object (); // Matching IP Address Patterns. IP = /^ (\ D {1,2} | 1 \ D | 2 [ 0 - 4 ] \ D | 25 [ 0 - 5 ]) (\. (\ D {1,2} | 1 \ D | 2 [ 0 - 4 ] \ D | 25 [ 0 - 5 ]) {3} $ / ; // Matching email address Patterns. Email = /^ [ - Za - Z0 - 9 _ - ] + @ [ - Za - Z0 - 9 _ -

Java Regular Expression example, java Regular Expression Import java. util. regex. matcher; import java. util. regex. pattern; public clas

$str = ' People's Republic of China 123456789ABCDEFG '; Echo Preg_match ("/^[\u4e00-\u9fa5_a-za-z0-9]{3,15}$", $strName); ?> Copy CodeRunning the above code, you will be prompted: Warning:preg_match (): compilation Failed:pcre does not support \l, \l, \ n, \p, \p, \u, \u, or \x at offset 3 In F:\wwwroot\php\test.php on line 2The reason for this is because: the following Perl escape sequences are not supported in PHP regular ex

PHP Tutorial Regular expression validation numbers Non-negative floating-point number (positive floating point + 0): ^d+ (. d+)? $Positive floating-point number ^ ([0-9]+.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*. [0-9]+) | ([0-9]*[1-9][0-9]*)) $Non-positive floating-point number (negative floating-point number + 0) ^ ((-d+ (. d+)?) | (0+ (. 0+)?)) $Negative floa

('. '); },/** * [True is overflow, false is non-overflow] * @param {[String]} v [number] */isoverflow:function (v , Len) {var L = v.length; Len >> 0; return l > Len; },/** * ID number and binding with "*" ID number verification **/isid:function (val) {val = Val.replace (/\s+/g, ' ); Return/(^\d{17} ([0-9]| X)) | (^[1-9]{1}[*]{16}[0-9| X]) $/.test (Val); },/** * Binds the bank card number and the user entered the bank card * @param string as well as

Java Regular Expression filters html tags and java Regular Expression tags Import java. util. regex. matcher; import java. util. regex. patt

= =) Alert (/^-?\d+\.\d+$/.test (This.value));"/>Real numbers:"text"Size=" -"onkeydown="if (Event.keycode = =) Alert (/^-?\d+ (\.\d+) $/.test (This.value));"/>Keep 1 decimal places:"text"Size=" -"onkeydown="if (Event.keycode = =) Alert (/^-?\d+ (\.\d{1,1})? $/.test (This.value));"/>Keep 2 decimal places:"text"Size=" -"onkeydown="if (Event.keycode = =) Alert (/^-?\d+ (\.\d{1,2})? $/.test (This.value));"/>Keep 3 decimal places:"text"Size=" -"onkeydown="if (Event.keycode = =) Alert (/^-?\d+ (\.\d{

"text/javascript">function check(v){var regex = new RegExp("^([\u4E00-\uFA29]|[\uE7C7-\uE7F3]|[a-zA-Z0-9_]){1,20}$");//不包含“-”//var regex =newRegExp("^([\u4E00-\uFA29]|[\uE7C7-\uE7F3]|[a-zA-Z0-9_-]){1,20}$");//包含“-”var res = regex.test(v);if(res==true){alert("包含中英文字母或下划线");return true;}else{alert("不包含中英文字母或下划线");return false;}}check(‘博客园90_qwe‘);JS Regular expression val