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grep: read an empty interval {,} as {0,}
GNU grep reads a{,} (a\{,\} in a basic regexp) as a{0,}. Oniguruma
takes {,} as literal text, so grep -E 'fo{,}' matched nothing and
grep 'fo\{,\}' failed with "invalid repeat range". Write {,} as {0,}
outside bracket expressions before compiling; a leading {,} then gets
the same warning as other leading intervals.jayhemnani9910:empty-interval Latest Branches
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