This is one of the biggest reasons for the rapid adoption and spread of the web.
The first web browser, World Wide Web (written by Tim Berners-Lee) was also an editor, allowing people to create web pages without learning HTML first. This could have been fixed, but it established an important precedent that exists in all web browsers to this day — that allowing people access to the content is more important than complaining about errors to people that won’t understand them or be in a position to fix them.
To clarify, I’m looking for a decent regular expression to validate URLs that were entered as user input with. As of Android API level 8 there is a WEB_URL pattern. Quoting the source, it "match[es] most part of RFC 3987". Experian Data Quality did both; they've also provided a definite benefit to our online checkout experience.The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.The most common three validators you’ll use are: In this Web Standards Curriculum article, we will cover how to use the first two of these, showing you how to validate markup, interpreting the typical kinds of results the validator gives you.