php 用戶名正則表達(dá)式(中文，英文，數(shù)字，字母）
Jun 08, 2016 pm 05:25 PM
php教程 用戶名正則表達(dá)式(中文，英文，數(shù)字，字母）
由字母a～z(不區(qū)分大小寫)、數(shù)字0～9、減號或下劃線組成
只能以數(shù)字或字母開頭和結(jié)尾 用戶名長度為4～18個字符
^[a-za-z0-9]{1}[a-za-z0-9|-|_]{2-16}[a-za-z0-9]{1}$
用戶名為大寫字母小寫字母或下劃線,并以字母開頭,長度為6-20
^[a-za-z][wd_]{5,19}
用戶名：包括英文小寫、漢字、數(shù)字、下劃線，不能全部是數(shù)字，下劃線不能在末尾
/^[a-z0-9_u4e00-u9fa5]+[^_]$/g
utf-8下
preg_match("/^[a-z0-9_x80-xff]+[^_]$/g",$a);
gbk下:
preg_match("/^[a-z0-9_".chr(0xa1)."-".chr(0xff)."]+[^_]$/",$a)
可有中文的用戶名驗(yàn)證
[a-za-z0-9][u4e00-u9fa5]
由于我們寫的表達(dá)式是匹配一個字符串的任何部分。它將不止認(rèn)為'mike_84′是合法字符串，同樣也會匹配類似'%! mike_84&'這種包含了我們不希望出現(xiàn)的東西的字符串。我們需要用到行定位點(diǎn)， ^ (caret) 和 $ (dollar) 字符將把我們的表達(dá)式限制在一個字符串的起點(diǎn)和終點(diǎn)位置，這樣可以確保整個用戶名符合我們的設(shè)定，而不是一部分。
所以修訂版的正則表達(dá)式象這樣：
/^[a-za-z0-9_]{3,16}$/
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