Regex for a valid URL

UNIX for Beginners Q & A
1

Hi guys,
What is the regex to check for only valid URL from a file using grep?

2

Hello Meeran,

As a starting point could you please try following and let me know if this helps you. Let's say we have following Input_file.

cat  Input_file
http://google.com/test
http://raddi.com/raddi

Following is the code for same.

awk '{match($0,/.*[:]\/\/.*\/[[:alnum:]]+/);print substr($0,RSTART,RLENGTH);}'  Input_file

Output will be as follows.

http://google.com/test
http://raddi.com/raddi

Thanks,
R. Singh

3

Hi.

See also thread Regex for URLs and files for a perl solution.

Best wishes ... cheers, drl