正则表达式仅允许使用0-9和-字符以及点（。）

Question

I Need a regex to validate 0-9 and allow . and - characters.

Following is working for 0-9 and . characters:

Regex invalidCharsRegex = new Regex(@"^*[0-9\.]+$");

Answer 1

Your regex is weird...

Regex invalidCharsRegex = new Regex(@"^*[0-9\.]+$");

Remove the first asterisk, it's not doing anything good.

And to allow - characters, you simply add it to the character class. Also, you don't need to escape the dot in a character class:

Regex invalidCharsRegex = new Regex(@"^[0-9.-]+$");

If you're trying to validate a number, this regex will have to be revised, because the regex will accept ---- or ..... . Something a bit like this for integer/floating numbers:

Regex invalidCharsRegex = new Regex(@"^\-?[0-9]+(?:\.[0-9]+)?$");

Answer 2

Regex invalidCharsRegex = new Regex(@"(?<=^| )\d+(\.\d+)?(?=$| )|(?<=^| )\.\d+(?=$| )");

这将允许使用数字1、1.2，.1等