string - Represent an ID code in regex -

string - Represent an ID code in regex -

i learned regex couple of days ago , , expand knowledge bit , match id code has letter first letter , sec letter may letter or integer . id_code has 2 letters long .

a{“a”-“z”|”0”-“9”} general representation of trying achieve,

so far got sec letter. need match first letter , sec letter in case it's number .

string.matches("-?[a-z]+")

this not homework or grade btw

there few ways this. favourite a[a-za-z0-9] because think readable way of managing it, though a[\d\w] quite graceful too.

regex string