Regular Expressions 101

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/
((?:[^\x00-\x7F]|[a-zA-Z]\s)+)(\d\/\d)
/
g
1st Capturing Group
((?:[^\x00-\x7F]|[a-zA-Z]\s)+)
Non-capturing group
(?:[^\x00-\x7F]|[a-zA-Z]\s)+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^\x00-\x7F]
Match a single character not present in the list below
[^\x00-\x7F]
\x00-\x7F matches a single character in the range between (index 0) and  (index 127) (case sensitive)
2nd Alternative
[a-zA-Z]\s
Match a single character present in the list below
[a-zA-Z]
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Capturing Group
(\d\/\d)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{2} matches the previous token exactly 2 times
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