![]() Originally, RFC 952 specified that hostname segments could not start with a digit. ValidHostnameRegex is valid as per RFC 1123. Depending on the language you use \ could have to be escaped with \. My preferred solution would show JUST the IP address and nothing else. It works, but I cannot use d as a character class to filter, which would be preferable. Create String from Regex Base-64 Encode String Base-64 Decode String Convert. Heres my solution: > adb shell 'ip addr show wlan0 grep -e inet 6' inet 192.168.0.19/22 brd 192.168.3.255 scope global wlan0. Inet 192.168.15.1 netmask 255.255.255.0 broadcast 192.168.15.255 ValidIpAddressRegex matches valid IP addresses and ValidHostnameRegex valid host names. Your IP address is saved on our web server for additional analytics. Therefore, the output highlights the following results: if. The result shows all instances where the letter i appears followed by an f in the. The regex searches for the character string. Note: The script is based on the output of ifconfig in Ubuntu 16.04. Run the following command to test how grep regex works: grep if. ![]() This will grep the exact IP Address, we can ignore any pattern look like an IP Address but not a valid one. ifconfig | head -19 | sed 'wlan0|\eth0' | awk '' Using regex to validate IP address is a bad idea - this will pass 999.999.999.999 as valid. ![]() An IP address is basically a dot separated sequence of 4 numbers each having 1 to 3 digits. I've come so close, so far i have tried about a million possible combinations but I'm close to exhausted, this is some of what i have tried. Now if you want to search for lines containing IP addresses, you’ll need to use some regular expressions. Linux grep + match exactly IP address with Regular Expression. ![]() I'm trying to learn as much as possible about Linux, I'm currently stuck at trying to grab specific parts of my ifconfig text display so it looks exactly like this: eth0: regex ascertain her kernel i do recompile, i sudo to her brain grep her strings and pipe her args, i cron her on my bash. There are a few ways to achieve this, using either ifconfig, ip, dig, or my personal favorite myip.Furthermore, there are even more ways to optimize your regex, many of which you have probably already seen in the comments of your previous question. ![]()
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