Java Regular Expression Review Question 2

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Question 1

What will be the output of the following snippet of code: 

String source = "I saw she said sake."; 
String regex = "s.."; 
Pattern p = Pattern.compile(regex); 
Matcher m = p.matcher(source); 
while(m.find()) { 
    System.out.println(m.group()); 
}


saw
she
sai
sak

Question 2

Complete the following snippet of code that will match two words-cat and cot in the input. When the code is run, it should print cat and cot on two separate lines.' 

String source = "cat camera can date cute cab cot"; 
String regex = /* Your code goes here */; 
Pattern p = Pattern.compile(regex); 
Matcher m = /* Your code goes here */; 
while(m.find()) { 
    System.out.println(m.group()); 
}


String source = "cat camera can date cute cab cot";
String regex = "c[ao]t";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(source);
while(m.find()) {
    System.out.println(m.group());
}

Question 3

Complete the following snippet of code that will replace all three-letter words that start with c with their uppercase equivalents.

The code should print "DIG DATe DEAd do DID DONe". 

String source = "dig date dead do did done"; 
String regex = "/* You code goes here*/"; 
Pattern p = Pattern.compile(regex); 
Matcher m = p.matcher(source); 
String str = m.replaceAll(mr -> mr.group().toUpperCase()); 
System.out.println(str);


String source = "dig date dead do did done";
String regex = "d[a-z]{2}";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(source);
String str = m.replaceAll(mr -> mr.group().toUpperCase());
System.out.println(str);
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