Regular Expressions 101

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/
6[5-9]|[78]\d|9[0789]|1[01]\d|12[012]
/
gm
1st Alternative
6[5-9]
6 matches the character 6 literally (case sensitive)
Match a single character present in the list below
[5-9]
5-9 matches a single character in the range between 5 (index 53) and 9 (index 57) (case sensitive)
2nd Alternative
[78]\d
Match a single character present in the list below
[78]
78 matches a single character in the list 78 (case sensitive)
\d matches a digit (equivalent to [0-9])
3rd Alternative
9[0789]
9 matches the character 9 literally (case sensitive)
Match a single character present in the list below
[0789]
0789 matches a single character in the list 0789 (case sensitive)
4th Alternative
1[01]\d
1 matches the character 1 literally (case sensitive)
Match a single character present in the list below
[01]
01 matches a single character in the list 01 (case sensitive)
\d matches a digit (equivalent to [0-9])
5th Alternative
12[012]
12 matches the characters 12 literally (case sensitive)
Match a single character present in the list below
[012]
012 matches a single character in the list 012 (case sensitive)
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)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String