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Home Backend Development PHP Tutorial 一个正则表达式的问题,数字的个数写1就可以匹配上,写比1大的就匹配不上了。

一个正则表达式的问题,数字的个数写1就可以匹配上,写比1大的就匹配不上了。

Jun 23, 2016 pm 02:02 PM

正则如下:

$patten='/^[1-9]\d{5}[1-2]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{4}$/';//就是最后这个4
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如果把最后那个4改成1,就能匹配的上,改成比1大的就不行了

这个正则是想用来匹配身份证号码的,如果哪位大侠有的话希望能发出来借鉴一下~兼容15位和18位的~


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表2.常用的限定符
代码/语法 说明
* 重复零次或更多次
+ 重复一次或更多次
? 重复零次或一次
{n} 重复n次
{n,} 重复n次或更多次
{n,m} 重复n到m次

15位的身份证不知道是怎么排列的,给你点参考

1、身份证号码含义:
一代(现已淘汰,不必判断了)
地区代码(6位)出生年(2位)出生月(2位)出生日(2位)顺号(3位) 共15位
二代
地区代码(6位)出生年(4位)出生月(2位)出生日(2位)顺号(3位)校验位(1位) 共18位
校验位可能是 X
2、简单判定,只需判断位数是否正确即可
/^\d{15}(?:\d{2}[\dX])?$/
3、精确判定(二代)应使用校验码生成算法。各种语言的“身份证校验码生成函数”都可以在网上找到

1、身份证号码含义:
一代(现已淘汰,不必判断了)
地区代码(6位)出生年(2位)出生月(2位)出生日(2位)顺号(3位) 共15位
二代
地区代码(6位)出生年(4位)出生月(2位)出生日(2位)顺号(3位)校验位(1位) 共18位
校验位可能是 X
2、简单判定,只需判断位数是否正确即可
/^\d{15}(?:\d{2}[\dX])?$/
3、精确判定……

	function validateIdNumber($idnumber){		$patten='/^\d{17}$/';		preg_match($patten,$idnumber,$match);		var_dump($match);//为什么这也显示的是FALSE??我16位就可以,加到17就不行了,这到底是什么问题啊???	}	validateidnumber(22111111111234563);
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validateidnumber(  "22111111111234563 " );

用字符串,数值的话就越界了
本来身份证号就应该是字符串

引用 2 楼 xuzuning 的回复:1、身份证号码含义:
一代(现已淘汰,不必判断了)
地区代码(6位)出生年(2位)出生月(2位)出生日(2位)顺号(3位) 共15位
二代
地区代码(6位)出生年(4位)出生月(2位)出生日(2位)顺号(3位)校验位(1位) 共18位
校验位可能是 X
2、简单判定,只需判断位数是否正确即可
/^\d{15}(?:\d……

好吧,我知道问题出在哪了,因为超过16位了以后数字就会变成科学计数方式,所以16位以上的就不是原来的数字了

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