带有两位小数的整数或浮点数的正则表达式 [英] regex for integer or floating point number with two decimals

问题描述

我想用正则表达式验证我的货币字段.我想允许以下模式条目

I want to validate my currency field with regex. I want to allow the following pattern entries

1.23
1
.45
0.56
56.00

不允许有逗号.我试过 \d+(\.\d\d) 但它只允许第一个、第四个和第五个条目.\d+(?:\.\d\d+)? 允许除第三个以外的所有.

No comma should be allowed. I've tried \d+(\.\d\d) but it allows only first, fourth and fifth entries. \d+(?:\.\d\d+)? allows all but third one.

推荐答案

在小数点前使用 \d* 而不是 \d+ 来匹配零个或多个数字.还要添加锚点(^ 和 $)，否则只要有任何匹配项，它就会通过.这也将验证一个空字符串，因此如有必要，您可以使用前瞻来确保至少有一个数字:

Use \d* instead of \d+ before the decimal to match zero or more digits. Also add anchors (^ and $) or else it will pass as long as there is any match available. This would also validate an empty string, so if necessary you can use a lookahead to make sure there is at least one digit:

^(?=.*\d)\d*(?:\.\d\d)?$

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