| Title |
Test
Find
Private IP address
|
| Expression |
(^10\.)|(^172\.1[6-9]\.)|(^172\.2[0-9]\.)|(^172\.3[0-1]\.)|(^192\.168\.)|(^127\.0\.0\.1) |
| Description |
It matches private IP addresses. Private IP addresses (as defined by RFC 1918) are not routable on public Internet. This would help if you want to grant some previlege only to the users from within local network. ***Importnat*** This pattern assumes that the input is a valid IP address. You many need to make sure the input is a valid IP address. |
| Matches |
10.12.0.19 | 172.21.0.23 | 192.168.0.2 |
| Non-Matches |
222.12.3.24 | 172.12.0.12 |
| Author |
Rating:
Not yet rated.
Mahesh Ramakrishnan
|
| Source |
|
| Your Rating |
|
Title: Small improvement
Name: Daniel Serodio
Date: 7/18/2011 5:48:28 PM
Comment:
The "beginning" (caret) character can be factored out, and you don't need so many parenthesis because "alternation" (pipe) has the lowest precedence of all regexp chars:
^(10\.|172\.1[6-9]\.|172\.2[0-9]\.|172\.3[0-1]\.|192\.168\.|127\.0\.0\.1).*
