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请教一下php正则表达式

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Release： 2016-06-23 13:35:31
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会员号为11位字母和数字组合，
前三位为“M15”后一位为”M”结尾。英文字母大小写可以忽略


回复讨论(解决方案)

/^M15[0-9a-z]{7}M$/i 

$str='M15452s8f1M';if(preg_match('/^M15([A-Za-z0-9]{7})M$/i',$str,$m)){	echo 'OK';}else{	echo 'NO';}
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请教一下php正则表达式
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