string str(“(555) 555-5555”); char chars[] = “()-“; for (unsigned int i = 0; i < strlen(chars); ++i) { // you need include <algorithm> to use general algorithms like std::remove() str.erase (std::remove(str.begin(), str.end(), chars[i]), str.end()); } // output: 555 5555555 cout << str << endl; To use as function: void removeCharsFromString( string &str, char* charsToRemove ) … Read more
Percent-encoded … You can use the @ character in HTTP URI paths if you percent-encode it as %40. Many browsers would display it still as @, but e.g. when you copy-and-paste the URI into a text document, it will be %40. … but also directly Instead of percent-encoding it, you may use @ directly in … Read more
Use repr: a = “Hello\tWorld\nHello World” print(repr(a)) # ‘Hello\tWorld\nHello World’ Note you do not get \s for a space. I hope that was a typo…? But if you really do want \s for spaces, you could do this: print(repr(a).replace(‘ ‘,r’\s’))
You almost had it right. The simplest way is mylist[0][0] # get the first character from the first item in the list but mylist[0][:1] # get up to the first character in the first item in the list would also work. You want to end after the first character (character zero), not start after the … Read more
Your view controller should conform to UITextFieldDelegate, like below: class MyViewController: UIViewController, UITextFieldDelegate { } Set the delegate of your textfield: myTextField.delegate = self Implement the method in your view controller: textField(_:shouldChangeCharactersInRange:replacementString:) All together: class MyViewController: UIViewController, UITextFieldDelegate // Set delegate to class @IBOutlet var mytextField: UITextField // textfield variable override func viewDidLoad() { super.viewDidLoad() … Read more
This should print the list of positions without the -1 at the end that Peter Lawrey’s solution has had. int index = word.indexOf(guess); while (index >= 0) { System.out.println(index); index = word.indexOf(guess, index + 1); } It can also be done as a for loop: for (int index = word.indexOf(guess); index >= 0; index = … Read more
What I stumbled upon is the difference between characters, unicode scalars and glyphs. For example, the glyph 👨👨👧👧 consists of 7 unicode scalars: Four emoji characters: 👨👩👧👧 In between each emoji is a special character, which works like character glue; see the specs for more info Another example, the glyph 👌🏿 consists of 2 unicode … Read more
If you want to get a UTF-16 encoded code unit as a char, you can parse the integer and cast to it as others have suggested. If you want to support all code points, use Character.toChars(int). This will handle cases where code points cannot fit in a single char value. Doc says: Converts the specified … Read more
Use this: String str = “testString”; char[] charArray = str.toCharArray(); Character[] charObjectArray = ArrayUtils.toObject(charArray);
How about this: fgrep -o f <file> | wc -l Note: Besides much easier to remember/duplicate and customize, this is about three times (sorry, edit! botched the first test) faster than Vereb’s answer.