To pull out valid IPv4 addresses paired with port numbers from your input text (while discarding all other content), you can use a regex tailored to validate both the IP and port ranges. Here's how to do it:

Strict Validation Regex #

This pattern ensures you only match valid IPv4 addresses (0.0.0.0 to 255.255.255.255) and valid ports (1 to 65535):

\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?):(?:6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3})\b

Simplified Regex (For Trusted Input) #

If you’re confident your input only contains valid IP:port pairs and don’t need strict validation, this faster pattern works well:

\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}:\d{1,5}\b

Example Implementation (Python) #

Here’s how to use the strict regex to extract and format your desired output:

import re

input_text = "1 138.68.161.60:1080 SOCKS5 HIA United States (New York NY) 138.68.161.60 (DigitalOcean, LLC) 174.64.234.29:17501 45.79.219.154:63189"

strict_pattern = r'\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?):(?:6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3})\b'
matches = re.findall(strict_pattern, input_text)
clean_output = ' '.join(matches)

print(clean_output)
# Output: 138.68.161.60:1080 174.64.234.29:17501 45.79.219.154:63189

Regex Breakdown (Strict Version) #

Let’s break down the components to understand how it targets exactly what you need:

• \b: Word boundary to avoid partial matches (e.g., an IP fragment inside a longer number)
• IPv4 Octet Validation: (?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
  • 25[0-5]: Matches values 250-255
  • 2[0-4][0-9]: Matches values 200-249
  • [01]?[0-9][0-9]?: Matches values 0-199 (covers single-digit, two-digit, and three-digit numbers)
• (?:...)\.{3}: Repeats the octet pattern three times, each followed by a dot (builds the first three parts of the IPv4 address)
• Final Octet: Same validation as above (completes the full IPv4 address)
• :: Literal colon separating the IP from the port
• Port Validation: (?:6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3})
  • Covers all valid port numbers from 1 to 65535 (excludes port 0, which is reserved)

内容的提问来源于stack exchange，提问作者Alex Loopan