Question

I want to parse last indian currency ie Rs from a string.

For example:

1. Price for this item is Rs. 100 –> 100
2. Price for this item is Rs. 100 to Rs. 120 –> 120
3. Price for this item is Rs. 100.2 to Rs. 125.4 –> 125.4
4. Price for this item is Rs. 100 to Rs. invalid_price –> 100
5. Price for this item is Rs. 100 to 125 –> 100, not 125 cause 125 is having Rs. in front of it.

Rs. or Rs both will be fine. I want to get number prepended with Rs. or Rs

How can I parse this string.

Answer 1

Goal is get the rightmost occurance of:

• The text “Rs”
• Optional abbreviation period “.”
• A space
• Digits and optionally a decimal point and more digits

Solution:

s = "Price for this item is Rs. 100.2 to 125.4"
s.scan(/Rs.? (\d+\.\d+|\d+)/).last
#=> 102.2

s = "Price for this item is Rs. 100.2 to Rs. 125.4"
s.scan(/Rs.? (\d+\.\d+|\d+)/).last
#=> 125.4