Regular Expressions 101

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/
([-])
/
gmui
1st Capturing Group
([-])
Match a single character present in the list below
[-]
ぁ-ゟ matches a single character in the range between (index 12353) and (index 12447) (case insensitive)
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)
u modifier: unicode. Enable all unicode features and interpret all unicode escape sequences as such
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
gmui

Test String