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php 正则表达式验证数字

Jun 13, 2016 am 11:18 AM
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php教程 正则表达式验证数字

非负浮点数(正浮点数 + 0):^d+(.d+)?$
正浮点数   ^(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*))$
非正浮点数(负浮点数 + 0) ^((-d+(.d+)?)|(0+(.0+)?))$
负浮点数  ^(-(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*)))$
浮点数  ^(-?d+)(.d+)?


^[1-9]d*$    

 //匹配正整数 

^-[1-9]d*$   

 //匹配负整数 

^-?[1-9]d*$ 

 //匹配整数 

^[1-9]d*|0$   

//匹配非负整数(正整数 + 0) 

^-[1-9]d*|0$ 

 //匹配非正整数(负整数 + 0) 

^[1-9]d*.d*|0.d*[1-9]d*$  

  //匹配正浮点数 

^-([1-9]d*.d*|0.d*[1-9]d*)$  

 //匹配负浮点数 

^-?([1-9]d*.d*|0.d*[1-9]d*|0?.0+|0)$  

 //匹配浮点数 

^[1-9]d*.d*|0.d*[1-9]d*|0?.0+|0$  

  //匹配非负浮点数(正浮点数 + 0) 

^(-([1-9]d*.d*|0.d*[1-9]d*))|0?.0+|0$  

 //匹配非正浮点数(负浮点数 + 0)


验证数字:^[0-9]*$
验证n位的数字:^d{n}$
验证至少n位数字:^d{n,}$
验证m-n位的数字:^d{m,n}$
验证零和非零开头的数字:^(0|[1-9][0-9]*)$
验证有两位小数的正实数:^[0-9]+(.[0-9]{2})?$
验证有1-3位小数的正实数:^[0-9]+(.[0-9]{1,3})?$
验证非零的正整数:^+?[1-9][0-9]*$
验证非零的负整数:^-[1-9][0-9]*$
验证非负整数(正整数 + 0)  ^d+$
验证非正整数(负整数 + 0)  ^((-d+)|(0+))$
验证长度为3的字符:^.{3}$

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