How do you escape a hyphen as character range in a POSIX regex

Question

I have a csv file full of values such as this:

0.00145423,3.03795e-05

I wanted to check that all the lines were consistent so I tried to gr

Answer 1

Remember that - is a range operator, so \-\ matches any character in the range \ to \, which is exactly a \.

If you move it to the end, it'll loose its meaning as a range, that's why it works.