When you want to search a file and extract all lines or regular expression matches, the Unix program, grep, is very handy. However, if you’re on a Windows machine or you have the contents of the text file you want to run grep on, you can easily run grep online using an online grep utility like the one at
http://www.online-utility.org/text/grep.jsp
It has many useful options like
- Invert Match (Display Non-Matching Lines)
- Ignore Case
- Line Number (as Output Prefix of Each Line)
- Only Matching (Print only the part of matching lines that actually matches PATTERN)
- Whole Line (Select only those matches that exactly match the whole line)
