Searching throguh array in custom inspector

Hello, i'm pretty new to custom inspectors and scripting. My question is: Is it possible to make some kind of custom inspector that when you would type in for example: "Hello" it would suggest you all the strings that you have in some kind of array or something like that that beggins with Hello. And than you would just click on the one you like. So it's like when you type "Debug." in script it suggests you Debug.Log etc...

Sorry if it's a dumb question but i can't seem to find asnwer anywhre..