How to check the first character of the string is numeric or not?

[nivets]

I have a field called Identifier which has values of server names.  I need to check the server names first character is number or not. Could you please let help me, used regex but not able to achieve it. thanks

eg ., server names

01234server1

01256server2

2345server3

Abcserver

bcdserver

[ITWhisperer]

Try something like this

| eval number=if(match(identifier,"^\d"),"True","False")