August 2012
Intermediate to advanced
609 pages
19h 16m
English
You want to check whether a certain string represents a valid IPv4 address in 255.255.255.255 notation. Optionally, you want to convert this address into a 32-bit integer.
Simple regex to check for an IP address:
^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$| Regex options: None |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby |
Accurate regex to check for an IP address, allowing leading zeros:
^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}↵
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$| Regex options: None |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby |
Accurate regex to check for an IP address, disallowing leading zeros:
^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}↵
(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$| Regex options: None |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby |
Simple regex to extract IP addresses from longer text:
\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b| Regex options: None |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby |
Accurate regex to extract IP addresses from longer text, allowing leading zeros:
\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]?)\b| Regex options: None |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby |
Accurate regex to extract IP addresses from longer text, dis25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9]allowing leading zeros:
\b(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}↵ (?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\b ...