The Domain Naming Service(DNS) is used to overcome this problem.
It maps one particular IP address to a string of characters.
DOTALL is a flag in most recent regex libraries that makes the . There is no 100% reliable solution since the RFC is way too complex. ] )*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_] )*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]\.[0-9]\.[0-9]\.[0-9]))(:[0-9])? $ This will make sure that every number in the IP address is between 0 and 255, unlike the version using \d which would allow for 999.999.999.999.
You could try to match for an extension, but there's no requirement for a file to have an extension.
There are probably dozens of way to format a phone number.
Make sure to be in global mode (g flag), case insensitive and to have the dot all option on.
This regular expression will match all HTML tags and their attributes.
This file path and file name are accessed from a Windows machine as well as Mac machine.
etc., but that gives trouble to my code running on Windows machine.
Consult this page for more details on this problem. For the actual date validity, you should rely on another language.
The following expressions will validate the number of days in a month but will NOT handle leap year validation; hence february can have 29 days every year, but not more. A SIN should also be validated by computing the checksum digit.
Your user interface should take care of the formatting problem by having a clear documentation on the format and/or split the phone into parts (area, exchange, number) and/or have an entry mask.