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

Last Updated : December 15, 2025

Problem Solution

In this program, we will create a string and then replace the numbers inside the string using the gsub() method with the regular expression and print the result.

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.

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