如何替换shell中的确切字符串？

Question

我只想替换shell中的确切字符串。

import UIKit

class ViewController: UIViewController {

    var other: ViewControllerB!

    override func viewDidLoad() {
        super.viewDidLoad()
        other = ViewControllerB(other: self)
    }

}

class ViewControllerB: UIViewController {
    let other: UIViewController

    init(other: UIViewController) {
        self.other = other
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

输出必须是：

str="My name is Sourav. My user name is Souravc. Sourav and Souravc is great person"

to_be_rplace="Sourav"

rplace_with=67776

Answer 1

使用\< pattern \>

$ sed 's/\<Sourav\>/67776/g' file
$ echo "My name is Sourav. My user name is Souravc. Sourav and Souravc is great person" | sed 's/\<Sourav\>/67776/g'
My name is 67776. My user name is Souravc. 67776 and Souravc is great person