Regular Expressions 101

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^[GCDZTSPKXLY1-9]\d{1,4}$
/
^ asserts position at start of the string
Match a single character present in the list below
[GCDZTSPKXLY1-9]
GCDZTSPKXLY
matches a single character in the list GCDZTSPKXLY (case sensitive)
1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)
\d
matches a digit (equivalent to [0-9])
{1,4} matches the previous token between 1 and 4 times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of the string
Your regular expression does not match the subject string.

Regular Expression
No Match

/
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Test String