Javascript reg ex组合

Question

var cost_price = "15..00"

/*Cost price should be such that it should contain numbers and may not contain more than one dot*/

if(/^([0-9])|([.])/.test(cost_price)){

    documet.write("Correct cost price");

}

现在，尽管cost_price中有两个点，我还是得到了问候消息。我应该在if条件中更改什么？

附言:我已经合并了2个注册表。一种是检查数字的正确性，另一种是检查点是否只出现一次。

Answer 1

为什么不去

/^[0-9]+(\.[0-9]+)?$/

并因此使最后一部分完全可选？( ?指定“匹配0到1次”)

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如果您希望允许.15，您可以将第一个[0-9]+ (匹配1到无限次)更改为[0-9]* (匹配0到无限次)。

Answer 2

对于您的情况，regex应该是这样的：

/^\d+(\.\d+)?$/

Answer 3

var cost_price = "15..00"

if (/\d+\.\d+/.test(cost_price)) {
    documet.write("Correct cost price");
} else {
    documet.write("Incorrect cost price");
}

http://regex101.com/r/cL8pP1

说明：

Match a single digit 0..9 «\d+»
   Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match the character “.” literally «\.»
Match a single digit 0..9 «\d+»
   Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»