grep ??

[bluestarmatrix]

if I'd a file like this


something
somethine123
begin something end
begin xyz end
somethingelse


and I want to find the strings only between begin and end, exluding begin and end;
How can I grep that?

[Roxoff]

I'm no expert at regular expressions, but you could try an Online Regular Expression Builder, such as this one. This can help you understand regex much better. You can feed these into grep as the search sequence.

[Manko10]

Use lookahead and lookbehind expressions:

grep -oP '(?<=begin ).+?(?= end)' file

[bluestarmatrix]

Thanks Manko10, It worked for me.
& Thanks Roxoff, that was really helpful in knowing the regs