How to grep variable pattern which is in first column
2902
external variable in awk
50962
Reading grep patterns from a file
43255
grep on a variable
23494
How to make  grep display only the matching regexp?
143395
How can I search (case-insensitive) in a column using LIKE wildcard?
107175
How to print matched regex pattern using awk?
13444
Can grep show only words that match search pattern?
14942
Extract a string between patterns/delimiters in R
136391
Use grep to find content in files and move them if they match
65479
Search for multiple patterns from a file using find command
101216
search multiple pattern in file and delete line if pattern matches
16787
How to select first occurrence between two patterns including them
14256
How to form a regex to recognize correct declaration of variable names
69214
How to use regex pattern in java?
11031
How can I grep in PDF files?
140097
R grep: is there an AND operator?
112581
Replacing pattern after nth match is found on each line?