Regular Expressions 101

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/
([^\u0000-\u007F]|\w)+
/
1st Capturing Group
([^\u0000-\u007F]|\w)+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
1st Alternative
[^\u0000-\u007F]
Match a single character not present in the list below
[^\u0000-\u007F]
\u0000-\u007F matches a single character in the range between (index 0) and  (index 127) (case sensitive)
2nd Alternative
\w
\w matches any word character (equivalent to [a-zA-Z0-9_])
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/

Test String