I want to find, in all the files in a directory, the pattern
t00 = 290 or t00 = 300 or t00 = -278 ...
in other words: (string "t00") + (1 or more white spaces) + (symbol "=") + (1 or more white spaces) + (perhaps a negative sign) + (number)
I have tried
grep -E "t00 += +-?\d" *
but it is not working as desired. Just trying I did
grep -P "t00 += +-?\d" *
and it works for Perl expressions. What am I do wrong in the case of extended regular expressions? I would like to use extended regular expressions instead of Perl because I have heard it is more common/universal (I may be wrong in this, though). Thx.