Question

我似乎无法使用简单的正则表达式。这就是我现在所拥有的：

$(".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个小数（小数点后只有两个数字）。它现在正常工作，但用户不能以小数开头。

可接受： 23.53 0.43 1111.43 54335.34 235.23 .53＆lt; ---不工作

×： 0234.32＆lt; ---用户目前可以这样做 23.453 1.343 .234.23 1.453.23

对此有何帮助？

Answer 1

fiddle Demo

RegExp -

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

解释

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

以下是一条建议：/^((\d|[1-9]\d+)(\.\d{1,2})?|\.\d{1,2})$/。

允许：0，0.00，100，100.1，100.10，.1，.10 ... < / p>

拒绝：01，01.1，100.，.100，. ......

Answer 3

这会满足您的需求吗？

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（\d+）。我也改了它，所以如果你包含一个小数，那么它后必须至少有一个数字。

Answer 5

这将迫使您在小数点分隔符后面添加数字：

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

示例：

123 =>是
1. =>假
123.1 =>是
123.12 =>假
123 .. =>假

如果您想输入更多数字； 3代表确保将小数点后的数字的最小值固定为“ 1”

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

数字和一位小数的正则表达式

5 个答案: