Скачать или смотреть How to Check if a String Contains a Substring Within an Array of Strings in Swift

Learn how to quickly determine if a string contains any word from an array of strings in Swift using practical examples and efficient code.
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This video is based on the question https://stackoverflow.com/q/69760554/ asked by the user 'Mochi' ( https://stackoverflow.com/u/3000433/ ) and on the answer https://stackoverflow.com/a/69760850/ provided by the user 'Joakim Danielson' ( https://stackoverflow.com/u/9223839/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Checking for Substrings in Swift

Have you ever found yourself needing to check if a specific string contains any words from an array of strings in Swift? For example, you might want to see if the phrase "A very nice beach" includes any terms from a list of keywords related to beaches and waterfronts. This is a common requirement in many applications, such as filtering search results, validating user inputs, or simply parsing text for specific keys.

In this guide, we will explore two effective ways to achieve this in Swift, breaking down the solutions for clarity and ease of understanding.

The Problem

Suppose you have the following string:

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and an array of keywords:

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The challenge is to determine if the string contains any of the words from the wordGroups array.

Solution 1: Using Regular Expressions for Exact Matches

To find an exact match for any of the words in the wordGroups, we can use Swift's regular expressions. Here's how to implement this:

Step-by-step Code

Initialize a boolean variable to track matches:

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Loop through the wordGroups and create a regex for each word:

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Now isMatch will be true if any word matches exactly.

Simplified Code Version

As suggested by the community, we can replace the loop with a more concise version using the contains method:

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This line does the same job but is more efficient and easier to read.

Solution 2: Simple Text Containment Check

If you don't need to check for exact matches but simply want to find out if the string contains any words from the array, here's a simpler approach:

Code Example

Using the contains(where:) method makes this straightforward:

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In this case, isMatch2 will be true for "A very nice beach" and will also return true for "Some very nice beaches", demonstrating that it simply checks for substring presence, irrespective of exact matches.

Summary of Solutions

Both solutions are effective, and the choice between them depends on your specific needs. Here's a quick recap:

Exact Match with Regex: Use when you need to ensure that the matches are whole words.

Simple Substring Presence: More straightforward and works well if the specific word count is not essential.

Feel free to choose the approach that best fits your requirements!



Now you can easily implement these functions in your Swift projects to check for substrings in a string against an array of keywords. Happy coding!