Question

New to regex syntax here. 努力写一个登记册,以提供一些意见验证。

What I need is a regex to match a whole number, or a decimal with exactly one digit past the decimal.

Good Match
1
12
100
1.1
100.1
1.0

No Match
1.22
1.
0
012

这里是我来的,但我没有做什么工作:

Regex.IsMatch(paidHours, "\d+[.]?[0-9]?")

Answer 1

www.un.org/Depts/DGACM/index_spanish.htm Edited response after OP question edit.

Regex.IsMatch(paidHours, @"^[1-9][0-9]*(.[0-9])?$");

解释:

^      : Start of the String
[1-9]  : A single number between 1 and 9
[0-9]* : Zero or more number(s) between 0 and 9 
         ([0-9]? would match zero or one number and the String "100" would not match the regex)
(      : Start of a group
.     : A point
[0-9]  : A single number between 0 and 9
)?     : End of the group. The group must be repeated zero or one time
$      : End of the String

请注意,d is not exactlyequi to [0-9]:dcompes any rel=“nofollow”>unicode 数/a>。例如,这一特性<代码>。如果您使用<代码>d,那么如果您使用<代码>[0-9],则将获得相应数据。

Answer 2

You can try with:

Regex.IsMatch(paidHours, "^\d+(\.\d)?$")

Answer 3

Regex.IsMatch(paidHours, @"^d+(.d)?$")

Answer 4

具体列明行乞/行乞:

@"^d+[.]?[0-9]?$"

如果你没有具体指明你希望打字端标有<代码>签字,你就会赢得笔记。

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