Regular expression for validating name bank consolidating student loans

A while back, we were performance profiling an application and noticed a big performance bottleneck while mapping objects using Auto Mapper.

Mapping is of course somewhat expensive, but the numbers we were seeing were way higher than expected: mapping was ridiculously slow!

NSMutable Attributed String // 2 let attributed Text Range = NSMake Range(0, attributed Text.length) attributed Text.remove Attribute( NSAttributed String.

Key.background Color, range: attributed Text Range) // 3 if let search Options = self.search Options, let regex = try?

You’re going to build a diary app for your boss — a Super Villain!

Everyone knows that Super Villains need to keep track of all their diabolical plans for world domination, right?

There’s lots of planning to do and you, as the minion, are part of these plans — your part being to build the app for the other plans!

The UI for the app is mostly complete, but the core functionality of the app relies on regular expressions, which it doesn’t have… Your job in this tutorial is to add the required regular expressions into this app to make it shine (and hopefully avoid being thrown into a vat of molten hot magma).

The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.

If you haven’t heard of regular expressions — also called regex — before, it’s probably worth wrapping your head around the basics before continuing with this tutorial. Check out this starter project in Xcode and run it.

Not a super big deal in itself, except that while mapping this validation was executed for a few thousand objects, resulting in around one second (sometimes more) to map these objects. Here’s the code that had the bottleneck:, supposed to be super fast?

And especially in this case, where we’re only validating the string consists of a set of allowed characters, and making sure the string length is between 1 and 254 characters in length?

Here are a few sample screen shots demonstrating the final product: The final app will cover two common use cases with regular expressions: There’s also a Reading Mode button that will allow highlighting all the dates, times and splitters between each entry in the diary.

Tags: , ,