数字和一位小数的正则表达式

Question

我似乎无法使用简单的正则表达式。 这是我目前所拥有的：

$(".Hours").on('input', function (e) {

    var regex = /^\d+(\.\d{0,2})?$/g;

    if (!regex.test(this.value)) {
        if (!regex.test(this.value[0]))
            this.value = this.value.substring(1, this.value.length);
        else
            this.value = this.value.substring(0, this.value.length - 1);
    }
});

我需要用户只能输入数字和一位小数（小数点后只有两个数字）。 它现在工作正常，除了用户不能以小数开头。

可接受：

23.53
0.43
1111.43
54335.34
235.23
.53 <--- Not working 

不可接受：

0234.32 <--- The user can currently do this
23.453
1.343
.234.23
1.453.23

这有什么帮助吗？

Answer 1

更新的答案：

正则表达式 -

^(?:0|[1-9]\d+|)?(?:.?\d{0,2})?$

regex101处的说明：

原答案：

小提琴演示

正则表达式 -

^(\d+)?([.]?\d{0,2})?$

说明

Assert position at the beginning of the string «^»
Match the regular expression below and capture its match into backreference number 1 «(\d+)?»
   Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
   Match a single digit 0..9 «\d+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match the regular expression below and capture its match into backreference number 2 «([.]?\d{0,2})?»
   Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
   Match the character “.” «[.]?»
      Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
   Match a single digit 0..9 «\d{0,2}»
      Between zero and 2 times, as many times as possible, giving back as needed (greedy) «{0,2}»
Assert position at the end of the string (or before the line break at the end of the string, if any) «$»

Answer 2

这是一个建议： /^((\\d|[1-9]\\d+)(\\.\\d{1,2})?|\\.\\d{1,2})$/ 。

允许： 0 , 0.00 , 100 , 100.1 , 100.10 , .1 , .10 ...

拒绝： 01 , 01.1 , 100. , .100 , . ...

Answer 3

这是否满足您的需求：

var regex = /^\d+([.]?\d{0,2})?$/g;

Answer 4

你的正则表达式： var regex = /^\\d+(\\.\\d{0,2})?$/g;

你需要什么： var regex = /^\\d*(\\.\\d{1,2})?$/;

您要求小数点前至少有一位数字 ( \\d+ )。 我也改变了它，所以如果你包含一个小数，它后面必须至少有一个数字。

Answer 5

这将迫使您在小数点分隔符后添加数字：

^\d+([.]\d)?$

示例：

• 123 => 真
• 123. => 假
• 123.1 => 真
• 123.12 => 假
• 123.. => 假

如果你想要更多的数字； 3 为前； 确保将小数后的数字的 min 固定为“1”

^\d+([.]\d{1,3)?$