如何在RegEx中进行模式匹配？

Question

I have a sample request asking for enrollment info for various account id's coming from UI, Showing below.

/api/v2/account/123/enroll?at_user=id_map:1345

The only thing that keeps on varying with the request will be "123" and "1345". I need to look for a string (in java Servlet) that looks exactly as above but with varying numeric value.

For Example, if a request come as below

/api/v2/account/444/enroll?at_user=* // should not process

/api/v2/account/654/enroll?at_user=id_map:1432 // Should process it

I was thinking of RegEx, But i am new to RegEx. how to do the pattern matching in RegEx

Answer 1

你需要：

"^/api/v2/account/\\d+/enroll\\?at_user=id_map:\\d+$"

Answer 2

Use \\d+ to match one or more digits. Since ? is special regex meta character, you need to escape it in-order to match a literal ? symbol.

"/api/v2/account/\\d+/enroll\\?at_user=id_map:\\d+"

ie,

if (string.matches("/api/v2/account/\\d+/enroll\\?at_user=id_map:\\d+"))
{ 
 // process
}
else
{
// don't process
}

Answer 3

You could use this

if (yourString != null && 
    yourString.startsWith("/api/v2/account/654/enroll?at_user=id_map:")) {

     //do your thing
}