javascript中的正则表达式只允许数字，逗号和单个小数点

Currently i am using this regex to match for positive numbers with a single decimal point

目前我正在使用此正则表达式来匹配具有单个小数点的正数

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

But this doesn't allow commas. How can i modify this to allow zero or more commas before the decimal point?

但这不允许使用逗号。如何修改它以允许小数点前的零或更多逗号?

Example :

11,111.00 (should be allowed) I am okay with numbers having any number of comma's before decimal point.

11,111.00(应该被允许)我可以使用小数点前有任意数字逗号的数字。

EDIT:

Valid values

111
11,111
11,111.0
111111

The values can be entered with or without comma. The datatype of this field is SQL MONEY, so it will handle comma's.

可以使用或不使用逗号输入值。该字段的数据类型是SQL MONEY,因此它将处理逗号。

4 个解决方案

#1

need

/^(?:\d{1,3}(?:,\d{3})*|\d+)(?:\.\d+)?$/

See the regex demo

请参阅正则表达式演示

Details

^ - start of string

^ - 字符串的开头

(?:\d{1,3}(?:,\d{3})*|\d+) - Either of:
- \d{1,3}(?:,\d{3})* - 1 to 3 digits followed with 0+ sequences of a , and 3 digits
- | - or
- \d+ - 1 or more digits

(?:\ d {1,3}(?:,\ d {3})* | \ d +) - 下列之一:\ d {1,3}(?:,\ d {3})* - 1到3位数后跟0和3位数的序列| - 或\ d + - 1位或更多位数

(?:\.\d+)? - an optional sequence of . and 1+ digits

(?:\。\ d +)? - 一个可选的序列。和1+位数

$ - end of string.

$ - 结束字符串。

var strs = [',,,,', '111', '11,111', '11,111.0', '111111'];
var re = /^(?:\d{1,3}(?:,\d{3})*|\d+)(?:\.\d+)?$/;
for (var s of strs) {
  console.log(s + " => " + re.test(s));
}

#2

This is a very simple general solution, without any assumptions about how many digits are needed.

这是一个非常简单的通用解决方案,没有任何关于需要多少位数的假设。

/^\d[\d,]*(\.\d+)?$/

[\d,] will match digits or commas.
You could make the regex more complicated if you really need it to be more specific.

[\ d,]将匹配数字或逗号。如果你真的需要它更具体,你可以使正则表达式更复杂。

#3

I would use this

我会用这个

^(?:\d{1,3}(,\d{3})*|\d+|\d{2}(?:,\d{2})*,\d{3})(?:\.\d+)?$

See demo and explanation

请参阅演示和说明

#4

This is pretty hard to read but I'll explain it

这很难读,但我会解释一下

/^(?:\d+)(?:(?:\d+)|(?:(?:,\d+)?))+(?:\.\d+)?$/

All the ?: are just to explicitly say to the regex engine "Don't capture the following group matched by this paren).

所有?:只是明确地对正则表达式引擎说“不要捕获这个paren匹配的下一组”。

The simplified version would be

简化版将是

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

But it'd capture a lot of matching groups for no reason so I removed them

但它无缘无故地捕获了很多匹配组,所以我删除了它们

#1