linux - HOW to solve the point in Regex? -


the file is:

google.com go.gle.com google.com.google.com b google.com.cloud.com c

when use way:

grep -nre  '^\<google.com\> ' file<br>

i can get:

1:google.com

but way:

grep -nre  '^\<go.gle.com\> ' file<br>

also :

1:google.com 2:go.gle.com

i want result " grep -nre '^\<go.gle.com\> ' file " is:

2:go.gle.com

not

1:google.com

how solve it?
ps： domain name in grep command "google.com" not fixed. maybe "goog.e.com" or ".oogle.com"

what you're looking (literal match) not possible grep options because grep treat matching pattern regex , hence dot mean any character.

you can use -f switch in grep or use fgrep fixed string match result:

grep -nf 'go.gle.com ' infile

or:

fgrep -n 'go.gle.com ' infile

alternatively following awk command give output you're looking for:

awk 'index($1, "go.gle.com"){print nr ":" $0}' infile

or exact match:

awk '$1 == "go.gle.com"{print nr ":" $0}' infile

note i'm using awk's index function or comparing equality ==, hence matching string not considered regex.

live demo: http://ideone.com/fl37sx


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