Regular Expressions 101

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/
^([^=]*)=.*$
/
^ asserts position at start of the string
1st Capturing Group
([^=]*)
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 6110 (3D16 or 758) literally (case sensitive)
= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String