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Unfortunately, it's also incorrect. Take a close at your output. You're clobbering digits with quotes.

Regards,
Alister

grep works with regular expressions (BRE) by default. Did you mean extended regular expressions (ERE) that support alternation (|) and enabling with the "-E" switch?


That will not fly, since...

The \b escape pattern doesn't work in my version of awk. I prefer match() to the ~ syntax, but either should work:


awk '
{
if( $0 ~ /[[:space:]](foo|bar|goo)[[:space:]]/ )
...

For grep to work with regular expressions you need to enable it (preferred) or use egrep:


grep -E "(good|great|excellent)" filename

The special OFS variable controls what awk's output separator is.
awk -F'|' '{ ... }' OFS='|' filename

You can even use this to transform lines with one separator into a different separator, but...

another way:-

gawk '/^R/&&s{print s ; s=""}{s=s$0}END{printf s}' file.txt


o/p
R|This is line 1
R|This is line 2
R|This is line 3
R|This is line 4
R|This is line 5


BR
;););)

One way:
awk 'NR==1{printf $0;next}/^R/{print ""}{printf $0}' file

and to eliminate the space from beginning do the code:-

gawk '/^R/&&s{sub(/^[ ]/,"",s) ; print s ; s=""}{s=s" "$0}END{sub(/^[ ]/,"",s);printf s}' file.txt