How to check if a string contains another string in Swift?

In Swift, you can check if a string contains another string by using the contains method of the String type. This method returns a Boolean value indicating whether the given substring exists within the string.

Here's how you can use it:

let mainString = "Hello, Swift World!"
let searchString = "Swift"

if mainString.contains(searchString) {
    print("The main string contains the search string.")
} else {
    print("The main string does not contain the search string.")
}

In this example, the output will be "The main string contains the search string."

If you want to perform a case-insensitive search, you can use the range(of:options:) method:

if mainString.range(of: searchString, options: .caseInsensitive) != nil {
    print("The main string contains the search string (case-insensitive).")
} else {
    print("The main string does not contain the search string (case-insensitive).")
}

This approach allows for more flexibility with search options and is useful when you need to modify the search behavior.

Swift check if string contains substring:

To check if a string contains a substring, you can use various methods and techniques.

Example:

let mainString = "Hello, Swift!"
let substring = "Swift"

if mainString.contains(substring) {
    print("The string contains the substring.")
} else {
    print("The string does not contain the substring.")
}

Checking for substring presence in Swift strings:

Use the contains method to check if a substring is present in a string.

Example:

let sentence = "Swift programming is powerful."
let keyword = "programming"

if sentence.contains(keyword) {
    print("Substring found.")
} else {
    print("Substring not found.")
}

Swift contains method for string matching:

The contains method is used to determine if a string contains another string.

Example:

let text = "Swift is fun!"
let searchTerm = "fun"

if text.contains(searchTerm) {
    print("String contains the search term.")
} else {
    print("String does not contain the search term.")
}

Searching for a substring in Swift strings:

Use the range(of:) method to search for a substring in a string.

Example:

let sourceString = "Swift is amazing!"
let searchString = "amazing"

if let range = sourceString.range(of: searchString) {
    print("Substring found at index \(range.lowerBound).")
} else {
    print("Substring not found.")
}

How to find if a string contains a character in Swift:

Check for the presence of a specific character in a string using contains.

Example:

let word = "Swift"
let characterToFind: Character = "i"

if word.contains(characterToFind) {
    print("String contains the character.")
} else {
    print("String does not contain the character.")
}

Case-insensitive string matching in Swift:

Use the range(of:options:) method with the .caseInsensitive option.

Example:

let text = "Swift is case-insensitive."
let searchTerm = "CASE-insensitive"

if let _ = text.range(of: searchTerm, options: .caseInsensitive) {
    print("Substring found (case-insensitive).")
} else {
    print("Substring not found.")
}

Checking multiple substrings in a Swift string:

Use a loop to check multiple substrings in a string.

Example:

let sentence = "Swift is versatile and powerful."
let keywords = ["Swift", "versatile", "powerful"]

for keyword in keywords {
    if sentence.contains(keyword) {
        print("Substring '\(keyword)' found.")
    } else {
        print("Substring '\(keyword)' not found.")
    }
}

Swift NSRange and string containment:

Use the NSString and NSRange to check if a string contains another string.

Example:

import Foundation

let mainString = "Swift is expressive."
let searchString = "expressive"

if (mainString as NSString).range(of: searchString).location != NSNotFound {
    print("Substring found using NSRange.")
} else {
    print("Substring not found.")
}

Comparing Swift strings for substring presence:

Use equality operators (== or !=) to directly compare strings.

Example:

let text = "Swift is awesome!"
let searchTerm = "awesome"

if text == searchTerm {
    print("Strings are equal.")
} else {
    print("Strings are not equal.")
}

Swift if statement with string contains check:

Use the contains method in an if statement for a concise check.

Example:

let message = "Hello, World!"

if message.contains("Hello") {
    print("Substring 'Hello' found.")
} else {
    print("Substring 'Hello' not found.")
}

Swift string rangeOf method for substring:

Use the range(of:) method to find the range of a substring.

Example:

let mainString = "Swift programming is fun."
let substring = "programming"

if let range = mainString.range(of: substring) {
    print("Substring found at index \(range.lowerBound).")
} else {
    print("Substring not found.")
}