java - java中数字和小数的正则表达式

Question

需要一个允许以下有效值的正则表达式。(只允许小数和数字)

有效:

.1  
1.10  
1231313  
0.32131  
31313113.123123123 

无效:

dadadd.31232  
12313jn123  
dshiodah  

Answer 1

如果您想严格限制允许的匹配:

^[0-9]*\.?[0-9]+$

解释:

^         # the beginning of the string
 [0-9]*   #  any character of: '0' to '9' (0 or more times)
 \.?      #  '.' (optional)
 [0-9]+   #  any character of: '0' to '9' (1 or more times)
$         # before an optional \n, and the end of the string

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