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A comment on What is [50-99] in regular expression?.

Re:What is [50-99] in regular expression? by gregjor on Monday December 12, 2022 @12:01PM (#33957087)
The O'Reilly book Mastering Regular Expressions maybe worth it. Old but regexes haven't changed much.

[50-99] matches 5, any character in the range 0-9, or 9. So the 5 and second 9 are redundant.

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