Implementing Regex In Bash - regex

Question

I am trying to throw an error if my text file lines have any combination of 5 [A-Z 0-9] chars followed by a comma and nothing else, like this:
WH3Y4,
H7UF5,
but my code is showing the error even when the text lines look like this, with spaces and words after the comma:
WH3Y4, my test
H7UF5, your test
The regex I am using below should work, if I understand how this is done:
^ to indicate the beginning of the text line
[A-Z0-9]{5} to indicate 5 chars of either cap letter or numbers
, to indicate they are followed by a comma
$ to indicate the end of the text line
So in theory, when it encounters any text after the comma on the same line, it should not produce the error, yet that's what's happening:
if ! [[ $myText =~ ^[A-Z0-9]{5},$ ]]; then
echo "Error"
continue
fi
Similarly, if I want to error when the text looks like this:
WH3Y4 test
H7UF5 test
this should work, but it doesn't either:
if ! [[ $myText =~ ^[A-Z0-9]{5} *[A-Za-z]$ ]]; then
echo "Error"
continue
fi
And when I try this as suggested in the comments:
[[ "$myText" =~ ^[A-Z0-9]{5},\$ ]]
it produces an error for this as it should:
WH3Y4,
H7UF5,
but also produces an error for this as it shouldn't:
WH3Y4, my test
H7UF5, your test
I thought the idea of the $ is to indicate the end of the line, but if the line continues with more chars then it should not match the error condition.

Answer 1

It seems that your code is not implementing what you want. You say
I am trying to throw an error if my text file lines have any combination
of 5 [A-Z 0-9] chars followed by a comma and nothing else
but then your code says
if ! [[ $myText =~ ^[A-Z0-9]{5},$ ]]; then
echo "Error"
continue
fi
The presence of the ! - the negation operator - means that it will print "Error" if the string does not match the regex, so it will accept the two sample strings your gave - WH3Y4, and H7UF5, - and will reject anything else. I think what you wanted here is
if [[ $myText =~ ^[A-Z0-9]{5},$ ]] ; then
echo "Error"
continue
fi
or in other words, just get rid of the !.
In the second case
if ! [[ $myText =~ ^[A-Z0-9]{5} *[A-Za-z]$ ]]; then
echo "Error"
continue
fi
the problem is that your regular expression doesn't match your data. I suggest that you use
if [[ $myText =~ ^[A-Z0-9]{5},[\ A-Za-z]+$ ]]; then
echo "Error"
continue
fi
Note that I dropped the ! in the this case as well.