Thread: Regex or String Algoritham

Hello please,
Appreciate your help here.
I have a field string that wants to find if that exists between two range strings on character basis.

Ex:

String lower boundary : "ABD"
String upper boundary : "ALGKP"
field String : "ABE"

Now the field string "ABE" exists between "ABD" and "ALGKP".
Here the comparison is char-by-char. i.e
A is b/w A & A, true
B is b/w B and L, true
E is b/w D and G, true
So finally returns true.

Another example:

For the same above boundaries, if the field string is "ABC", it should return false since C not b/w D & P.
For the same above boundaries, if the field string is "AB", it should return true.

Thanks
Dileep

One of the tricks I like to use with these kind of String computation problems is to treat the characters in the string like numbers. Try using charAt then casting the char into an int. The value of the int will be in the range 65..90 for 'A' to 'Z' (case sensitive). This will reduce your problem to a simple integer range check.