ruby - I am not able to increment string contains integer value? -

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how increment last string based on last integer ?for eg."foo" = "f001", "foo9" = "foo10", "foo99" = "foo100","foo001" = "foo002"

one way this...

def increment_string(string)   old_digits = string.scan(/\d+$/).first || ''   string.sub(/\d+$/,'') + (old_digits.to_i+1).to_s.rjust(old_digits.size, '0') end  p increment_string("beep") => "beep1"  p increment_string("beep5") => "beep6"  p increment_string("beep99") => "beep100"  p increment_string("beep004") => "beep005"

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