How to match string starting with one of the two specified chars followed by two or more digits

Question

• Matches : X23, A4858, A09387373, X90
• Non-matches : G23, X23H, A48B59, A48BA484646

I came up with the following,

var rex = new Regex(@"^([AX](\d\d)+)");

but this matches X23H, A48B59,A48BA484646

How do I make sure it's a string starting with either 'A' or 'X' and then followed by two or more digits?

Answer 1

使用n可以完成某种模式的至少{n,}。您可能还想标记字符串的结尾。尝试做：

var rex = new Regex(@"^([AX]\d{2,})$");

Answer 2

您错过了end of line anchor（$）：

var rex = new Regex(@"^([AX](\d\d)+)$");

这就是为什么你的表达式在开始时正确匹配，但是＃34;抓取太多＆＃34;最后。

Answer 3

这应该可以正常工作...... 它采取的是＆＃39; A＆＃39;或者＆＃39; X＆＃39;作为第一个字符，后跟2个数字。

var rex = new Regex(@"^[AX]{1}\d{2}$");

您可以使用^和$来最好地满足您的要求以及regexOptions。