Regular Expressions 101

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/
^[^\n]\n(.)
/
^ asserts position at start of the string
Match a single character not present in the list below
[^\n]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\n matches a line-feed (newline) character (ASCII 10)
\n matches a line-feed (newline) character (ASCII 10)
1st Capturing Group
(.)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String