bug#24609: egrep '2\.?[0–9]' datafile does not work as expected

[Lam Bruce]

Dear Sir/Madam:

      I put all files in the atttachment.

       cat datafile

northwest NW Charles Main 3.0 .98 3 34
western WE Sharon Gray 5.3 .97 5 23
southwest SW Lewis Dalsass 2.7 .8 2 18
southern SO Suan Chin 5.1 .95 4 15
southeast SE Patricia Hemenway 4.0 .7 4 17
eastern EA TB Savage 4.4 .84 5 20
northeast NE AM Main Jr. 5.1 .94 3 13
north NO Margot Weber 4.5 .89 5 9
central CT Ann Stephens 5.7 .94 5 13
989

egrep '2\.?[0–9]' datafile
eastern EA TB Savage 4.4 .84 5 20

egrep '2\.{0,1}[0–9]' datafile
eastern EA TB Savage 4.4 .84 5 20

egrep '2\.\{0,1\}[0–9]' datafile

egrep '2\.{0,1}[0-9]' datafile
western WE Sharon Gray 5.3 .97 5 23
southwest SW Lewis Dalsass 2.7 .8 2 18
eastern EA TB Savage 4.4 .84 5 20

egrep -n '2\.{0,1}[0-9]' datafile
2:western WE Sharon Gray 5.3 .97 5 23
3:southwest SW Lewis Dalsass 2.7 .8 2 18
6:eastern EA TB Savage 4.4 .84 5 20

Best Regards,

Bruce

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