Useful String extensions in swift

StringExtension.swift

import Foundation

extension String {
    var wordCount: Int {
        let regex = try? NSRegularExpression(pattern: "\\w+")
        return regex?.numberOfMatches(in: self, range: NSRange(location: 0, length: self.utf16.count)) ?? 0
    }
    func toInt() -> Int? {
        return Int(self)
    }
    func toDouble() -> Double? {
        return Double(self)
    }
    func toFloat() -> Float? {
        return Float(self)
    }
    func isEmailValid() -> Bool {
        guard !self.isEmpty else { return false }
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        return emailPred.evaluate(with: self)
    }
    func isPhoneNumberValid() -> Bool {
        guard !self.isEmpty else { return false }
        let phoneNumberRegex = "^[6-9]\\d{9}$"
        let phonePred = NSPredicate(format: "SELF MATCHES %@", phoneNumberRegex)
        return phonePred.evaluate(with: self)
    }
    func localized() -> String {
        guard !self.isEmpty else { return self }
        let result = NSLocalizedString(self, bundle: Bundle.main, comment: "")
        // If you are using any custom bundle in your app you can pass that in bundle parameter
        if result != self {
            return result
        }
        return self
    }
    func withPrefix(_ prefix: String) -> String {
        guard !self.hasPrefix(prefix) else { return self }
        return "\(prefix)\(self)"
    }
}