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^[A-Z0-9]*[ _][A-Z0-9]*$
space cannot be accepted either at the beginning or end.
space cannot be accepted at all instead of the value.
allow numbers and characters in the start and end.
allow hyphens in the middle not mandatory
All these values are accepted values
12345
ABC-12345
MM 1.8.10
530715 HS 9JAXXX4100
020-59898
HLXU1234
But when i type ABC BCD. It says it is not correct match
[^ ]= cannot start or end with space([\w- .]+)= all characters allowed (or in this case, \w, hyphen, space and dot)matches:
ABC BCD