On our street, odd numbers always end on the same side of the road and Fake St is a very busy street, so we rarely get to cross and meet the neighbors on the other side. A house number that is 2 or 3 digits long and ends with an odd number.Working step-by-step, we can define the rules we want to use to validate. An example of a valid address may look like this: let address = """ We decide the best way for our users to verify that they belong to our neighborhood is for them to enter their address so we can use a regular expression to check whether they meet our criteria. Imagine that we are very close with the neighbors on our street and want to build an application for ourselves. What does it look like to “build” a regex pattern now and what are some of the new ways you might choose to work with that same expression in Swift 5.7? Let’s look at an example. Email addresses and non-standardized date formats are two classic examples.Īll of these problems can lead to a substandard experience and developers often choose to use expensive and complicated string processing and transformation APIs instead.Īpple and the Swift community are looking to alleviate some of that pain for us in Swift 5.7 and through improvements in Xcode 14 by introducing the RegexBuilder and making regexes feel like more of a modern first-class citizen in the language than it ever has before. These expressions can quickly become large and difficult to work through, especially in cases where the data being matched doesn’t have an established standard or where the standard is vague. Also, the difficulty to read and write also makes them difficult to understand.
As useful as they are, they can also require a lot of memorization of esoteric symbols and escaped characters. Regular expressions (regexes) haven’t changed much since their introduction in the 50s and native language support for them has been similarly stagnant in its design.
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IOS 16 tries to solve this by introducing a new intuitive way how to write and understand regular expressions with the RegexBuilder. Remember the last time you were trying to validate an email address? Or you struggled to create a RegEx to find all the matches for a specified pattern in a string? Chances are high that you ended up just copying a RegEx (that you didn’t understand) from the internet.
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