正则表达式匹配“ CP”，后跟3-5位数字

Question

接受“ CP123”的前两个字母CP和其他3或4或5个数字的正则表达式是什么。

Answer 1

CP[0-9]{3,5}

Answer 2

This will match your requirements:

^CP\d{3,5}$

The ^ matches the beginning of the string, so that it doesn't allow any characters to the left of "CP".

\\d matches a digit, {3,5} makes it match 3-5 digits.

The $ matches the end of the string, so that it doesn't allow any characrers after the digits.

If you are using the regular expression in a validation control, you can remove the ^ and $, as that is added by the control:

CP\d{3,5}

Answer 3

这适用于所有正则表达式引擎：

CP[0-9]{3,5}

Answer 4

As per update in comments:

CP\d{1,5} 

if you want one to five digits following CP. Otherwise use

CP\d+ 

if you just want CP followed by at least one digit.

Answer 5

即使您的问题不是很清楚，这也应该起作用：

r'^CP[0-9]{3,5}$'

Answer 6

Regex regxExp = new Regex( "CP[0-9]{3,5}" );
bool result = regxExp.IsMatch( //Expression );

Answer 7

"$CP123[3-5]^"