Swift Tutorials

How to keep only Alphabets in a String in Swift

How to keep only Alphabets in a String in Swift ?

Answer

To keep only alphabets in a string in Swift, you can use regular expressions from the 'Foundation' framework to remove non-alphabetic characters.

✐ Examples

1 Keep Only Alphabets in "Hello123 World"

In this example,

We import the 'Foundation' framework to use regular expressions.
We create a string variable str1 with a value of "Hello123 World".
We define a regular expression pattern [^a-zA-Z] to match non-alphabetic characters.
We use the replacingOccurrences method with the regular expression pattern to replace all non-alphabetic characters with an empty string.
Finally, we print the modified string str1.

Swift Program

import Foundation

var str1 = "Hello123 World"
let pattern = "[^a-zA-Z]"
let reg = try! NSRegularExpression(pattern: pattern)
str1 = reg.stringByReplacingMatches(in: str1, options: [], range: NSRange(location: 0, length: str1.utf16.count), withTemplate: "")
print("Modified string: \(str1)")

Output

Modified string: HelloWorld

2 Keep Only Alphabets in "apple@banana"

In this example,

We import the 'Foundation' framework to use regular expressions.
We create a string variable str2 with a value of "apple@banana".
We define a regular expression pattern [^a-zA-Z] to match non-alphabetic characters.
We use the replacingOccurrences method with the regular expression pattern to replace all non-alphabetic characters with an empty string.
Finally, we print the modified string str2.

Swift Program

import Foundation

var str2 = "apple@banana"
let pattern = "[^a-zA-Z]"
let reg = try! NSRegularExpression(pattern: pattern)
str2 = reg.stringByReplacingMatches(in: str2, options: [], range: NSRange(location: 0, length: str2.utf16.count), withTemplate: "")
print("Modified string: \(str2)")

Output

Modified string: applebanana

Summary

In this tutorial, we learned How to keep only Alphabets in a String in Swift language with well detailed examples.

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How to keep only Alphabets in a String in Swift

How to keep only Alphabets in a String in Swift ?

Answer

✐ Examples

1 Keep Only Alphabets in "Hello123 World"

Swift Program

Output

2 Keep Only Alphabets in "apple@banana"

Swift Program

Output

Summary

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