Regular Expressions 101

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/
^([^,]*,){1}jeremy,
/
^ asserts position at start of the string
1st Capturing Group
([^,]*,){1}
{1} matches the previous token exactly one time (meaningless quantifier)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Match a single character not present in the list below
[^,]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
jeremy,
matches the characters jeremy, literally (case sensitive)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/

Test String