正则表达式用于字符串中至少一定数量的数字 [英] Regex for at least a certain number of digits in a string

问题描述

当用户提交表单时，我需要确保输入内容至少包含最小位数.问题是我不知道输入将采用哪种格式.数字可能不会连续出现，并可能由字母，标点符号，空格等分隔.我不在乎其余的数字字符串.

When a user submits a form I need to make sure that the input contains at least a minimum number of digits. The problem is that I don't know what format the input will be in. The digits likely won't be in a row, and might be separated by letters, punctuation, spaces, etc. I don't care about the rest of the string.

我想用RegularExpressionValidator进行检查，但是我不太确定如何编写正则表达式.

I'd like to check this with a RegularExpressionValidator but I'm not quite sure how to write the regex.

我想这类似于电话号码正则表达式，但是电话号码至少具有某些常见格式.

I guess this would be similar to a phone number regex, but a phone number at least has some common formats.

推荐答案

以下内容将匹配至少包含 n 个数字的输入字符串:

The following will match an input string containing at least n digits:

Regex.IsMatch(input, @"(\D*\d){n}");

其中 n 是整数值.

简短说明:

• \ D * 匹配零个或多个非数字字符( \ D 是 [^ 0-9] 的简写，或 [^ \ d] );
• 因此 \ D * \ d 匹配零个或多个非数字字符，后跟一个数字；
• 和(\ D * \ d){n} 分组并重复以前的 n 次.

• \D* matches zero or more non-digit chars (\D is a short hand for [^0-9] or [^\d]);
• so \D*\d matches zero or more non-digit chars followed by a digit;
• and (\D*\d){n} groups, and repeats, the previous n times.

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