To change the last two letters : sub with regular expressions « String « Ruby

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Ruby » String » sub with regular expressions 
To change the last two letters


x = "This is a test"
puts x.sub(/..$/, 'Hello')

 
Related examples in the same category
1.Basic Special Characters and Symbols Within Regular Expressions
2.Regular Expression Character and Sub-Expression Modifiers
3.To replace the first two characters of a string with 'Hello':
4.scan is the iterator method you require:
5.scan(/../): . means Any character
6.scan (/\w\w/): \w means Any letter, digit, or underscore
7.Index string by regular expression
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