How can we validate the string with a pattern?
eg. Value should always be of the format C-DDD,
where C is a character (A-Z or a-z) and
D represents a digit(0-9)
Valid forms are A-001, A-987, Z-098 and
not valid forms are A-01, 1-A01, 1- 0A0, A-A01, A-0001
Say internal table contains values like this.
F1 F2 F3
1 00001 A-001
2 00001 A-A01
3 00001 B-909
4 00001 Z-01
5 00001 k-0001
Valid records are 1 and 3.