I'm strugging a bit to get matching results from grep.
Given the following input file's contents
{"foo":29, "bar":30}
and the following command grep -o '"[^"]+":[0-9]+' input.txt, I'm expecting two matching results. As far as I know it supports regular expressions, but I don't understand why grep doesn't return any results?
Other implementations of regexp are working fine (https://regex101.com/r/RcONXk/1).
you can try this;
grep -oE '"[^"]+":[0-9]+'
Eg:
user@host:/tmp$ echo '{"foo":29, "bar":30}' | grep -oE '"[^"]+":[0-9]+'
"foo":29
"bar":30
man grep :
-E, --extended-regexp
Interpret PATTERN as an extended regular expression (ERE, see below). (-E is specified by POSIX.)
Basic vs Extended Regular Expressions
By default, grep does not match regex. Either use the e flag:
grep -oe 'pat' file
Or use egrep (automatically treats pattern as regex).
egrep -o 'pat' file
