Regular Expressions 101

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/
[\u4E00-\u9FFF]
/
g
Match a single character present in the list below
[\u4E00-\u9FFF]
\u4E00-\u9FFF matches a single character in the range between (index 19968) and 鿿 (index 40959) (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
g

Test String