Regular Expressions 101

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/
^[-]\s++(.+$.+$.+$)
/
gmsU
^ asserts position at start of a line
Match a single character present in the list below
[-]
- matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
++ matches the previous token between one and unlimited times, as many times as possible, without giving back (possessive)
1st Capturing Group
(.+$.+$.+$)
.
matches any character
+ matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
$ asserts position at the end of a line
.
matches any character
+ matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
$ asserts position at the end of a line
.
matches any character
+ matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
s modifier: single line. Dot matches newline characters
U modifier: Ungreedy. The match becomes lazy by default. Now a ? following a quantifier makes it greedy
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmsU

Test String