So, lets start Topics What are this regular expressions?
The regular expressions How to use these regular expressions in PHPResources References Foot notes If we compare multiple strings of text related to the same subject, lets same names and last names, we can see that patterns emerge.
Originally I was going to recommend the Firefox add-on "Regular Expression Tester" but it failed me for some complex expressions, which I find odd as I remember me testing some back then with this Firefox add-on.
If that is the case it may result impractical to check for every existing top-level domain inside the regular expression, personally I may opt for just check the formatting, extract the top-level domain and search it in a database of top-level domains, but we are not there yet, so this should work just fine for the time being.
You may add |onion after the xxx if you need to use the tor network, or |bit if you use the experimental nameserver bitname.
For example, a ZIP code must consist of five digits, and a last name must contain only letters, spaces, apostrophes and hyphens.
One application of regular expressions is to facilitate the construction of a compiler.
Additionally, if you use domains that allow internationalized domain names, you may need to add extra accepted characters to the regular expression.
I may make new strings suited for different regions in a future, check back the article or send me an message in the contact form at Contact if you have any comments on this.
This isn't a guide about how to create regular expressions (although I would like to make one).
These are a few regular expression that I made some time ago, when I had access to a list of names, addresses, phone numbers, etc.
Often, a large and complex regular expression is used to validate the syntax of a program.
If the program code does not match the regular expression, the compiler knows that there is a syntax error within the code.
As usual, xkcd explains it nicely: A name I believe this regular expression works for most names with foreign characters, or at least it works with everything I had available, it also allows to use composite names (such as Sackville-Baggins).