Aritcle about Hexagobal grids with interactive examples
PHPVerbalExpressions - the easiest way to start with Regular Expressions. Write it in OOP way
$regex=new VerbalExpressions;
$regex ->startOfLine()
->then("http")
->maybe("s")
->then("://")
->maybe("www.")
->anythingBut(" ")
->endOfLine();
$regex->test("http://d.com")
A lot of implementations on other languages exist
Aritcle about Hexagobal grids with interactive examples
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