JavaScript registered user common regular validation code

Mailbox Verification

The code is as follows	Copy Code
var re =/^[_a-za-z0-9-.] +@ ([-_a-za-z0-9]+.) +[a-za-z0-9]{2,3}$/; if (!thisinput.value.match (re)) { Regemailinfo.classname = "Show err"; regemailinfo.innerhtml = "Input does not conform to specification"; }

Filter spaces and

The code is as follows	Copy Code
String.prototype.trim = function () { Return This.replace (/(^s*) | ( s*$)/g, ""); }

Regular Chinese characters

The code is as follows	Copy Code
Count string byte number, return integer String.prototype.ByteCount = function () { TXT = this.replace (/(<.*?>)/ig, ""); TXT = txt.replace (/([u0391-uffe5])/ig, "11"); var count = txt.length; return count; }

User name Verification

code is as follows	copy code
var re =/^[ a-za-z1-9_]{6,20}$/;        if (!thisinput.value.match (re)  {    Reguserinfo.classname = "Show err";   reguserinfo.innerhtml = "Input does not conform to specification";  }