Ruby program to replace number within a string using gsub() method with regular expression

Program/Source Code:

The source code to replace a number within a string using the gsub() method with a regular expression is given below. The given program is compiled and executed successfully.

# Ruby program to replace number within a string 
# using gsub() with regular expression

str = "There are 4 persons.";

str = str.gsub(/\d+/, "6")

print str;

Output:

There are 6 persons.

Explanation:

In the above program, we created a string str initialized with "There are 4 persons.". Then we replaced the number inside the string using the gsub() method with regular expression. After that, we printed the updated string.