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Extracting IP addresses from text
PHP
Medium
regex
Task «Extracting IP addresses from text»
Write a PHP program that reads lines from standard input and extracts all valid IPv4 addresses from them. An IP address consists of four numbers from 0 to 255, separated by dots. Leading zeros are not allowed unless the number is 0. Addresses may be surrounded by spaces or punctuation marks. Output each found address on a separate line in the order they appear in the text. If no addresses are found, output an empty line.
Input Format
Several lines of text, each up to 1000 characters long. The total number of lines does not exceed 100.
Output Format
Each found IPv4 address on a separate line in the order of appearance. If there are no addresses, output an empty line.
Examples
Example 1
INPUT
Connect to 172.16.0.1 and 192.168.0.255
OUTPUT
172.16.0.1
192.168.0.255
Example 2
INPUT
Invalid addresses: 256.1.2.3, 1.2.3.4.5, 0.0.0.0
OUTPUT
0.0.0.0
Example 3
INPUT
Invalid: 999.1.2.3 but valid: 1.2.3.4
OUTPUT
1.2.3.4
Example 4
INPUT
No addresses here!
OUTPUT
main.php