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tripossi
Asked: 2020-04-25 10:09:21 +0800 CST 2020-04-25 10:09:21 +0800 CST

Check if a String contains specified substring

  • 772

I want to check if the String string contains an "= " and that "= " is followed by an alphanumeric character. For example:

String cadena1 = "= 'hola"; //patron.matcher(cadena1); devuelve false
String cadena2 = "= hola";  //patron.matcher(cadena2); devuelve true
String cadena3 = "= 1";  //patron.matcher(cadena3); devuelve true

The regex I am using is:

Pattern patron = Pattern.compile("=\\s[\\w]");
Matcher matcher = patron.matcher(cadena);
java

2 Answers

  1. Best Answer

    The expression is fine, you have to call the find()matcher method to find the first match:

     if(matcher.find()){
     System.out.printf("encontrado");
 }
    • 1

  2. You should use it like this, using the find() method:

      Pattern patron = Pattern.compile("=\\s[\\w]");
  Matcher matcher = patron.matcher(cadena);

  boolean contiene = matcher.find();
  System.out.println("Contiene cadena especifica? "+ contiene);
    • 1