How to accept multiple vales from Botkit hears method?

Code:

controller.hears([map (.*) (.*) into (.*)){
  var value = message.match[1];
        var source = message.match[2];
        var dest = message.match[3];   }

when input is map 12 grams to kilograms it works fine but when input is map 12 square meter into square centimeter then output is value = 12 square, source= meter and dest = square centimeter

How to modify the code so that the value field accepts only number so that square meter goes to source field

You may use

map (\d+) (.*) into (.*)

See the regex demo

The first capturing group is now (\d+) and will only capture 1 or more digits.

You may also match 1+ whitespaces in between values using \s+ (so, tabs and other whitespace will also be matched, 1 or more occurrences):

map\s+(\d+)\s+(.*?)\s+into\s+(.*)

See this regex demo.

Details

• map - a map substring
• \s+ - 1+ whitespaces
• (\d+) - Group 1: one or more digits
• \s+
• (.*?) - Group 2: any 0+ chars other than line break chars, as few as possible,
• \s+ - 1+ whitespaces
• into - into substring
• \s+ - 1+ whitespaces
• (.*) - Group 3: any 0+ chars other than line break chars, as many as possible.