🔰Regex

Swift ⟩ Regex

💈範例

// NSRegularExpression, NSString.range(of:)
import Foundation

// One or more characters followed by an "@",
// then one or more characters followed by a ".",
// and finishing with one or more characters
let emailPattern = #"^\S+@\S+\.\S+$"#

// Matching Examples
// [e-mail]
// [e-mail]

// ----------- method 1: string.range() -------------

// ⭐️ 1. string.range()
let range = "[e-mail]".range(
    of: emailPattern,
    options: .regularExpression
)
// range: Range<String.Index>?

// ----------- method 2: regex.matches() -------------

// ⭐️ 2.1 NSRegularExpression
let emailRegex = try! NSRegularExpression(
    pattern: emailPattern, options: []
)

// ⭐️ 2.2 NSRange
let source = "[e-mail]"
let sourceRange = NSRange(
    source.startIndex ..< source.endIndex,
    in: source
)

// ⭐️ 2.3 regex.matches()
let matches = emailRegex.matches(
    in: source,
    options: [],
    range: sourceRange
)
// matches: [NSTextCheckingResult]

📗 參考

• Advanced Swift ⟩

  • Email, Phone, Username, Password, and Date Regular Expressions in Swift

  • Regular Expression Capture Groups in Swift

• Paul ⟩ How to use regular expressions in Swift

• Loaf ⟩ Getting Started with Swift Regex (⭐️ Swift 5.7)

📘 手冊

• Foundation ⟩ NSString

  • .range(of:)

  • range(of:options:)

  • NSString.CompareOptions

🛠 工具

• Swift Regex