how to use sed to replace a line in a file

Question

I have a Podspec and I want to change the version in that file using sed and regex. the line is below

s.version  (ignore spaces)  =  (ignore spaces) "x.x.x"

What would be the exact sed command to change this version.

Answer 1

Simply use

~$ sed 's/^\(s.version *= *\)"[^"]*"/\1"a.b.c"/' myfile

You can use the -i option to modify in place the file.