regex - Using positive lookahead in Ruby -


i'm writing regular expression following phrase variations:

  • "cart total greater $5.00"
  • "cart total less $5.00"
  • "cart total greater 5.00" (notice no $ in number... what's failing)

i'm capturing 2 things: word "greater" or "less" , amount. want capture amount whether there's dollar sign in or not, what's tripping me up.

here's regexp:

/^.*(?=cart total).*(?=(greater|less)).*(?=\$([0-9.]+))/

this: 

"cart total greater $5.00".match(/^.*(?=cart total).*(?=(greater|less)).*(?=\$([0-9.]+))/)

gets me "greater" , 5.00 this:

    "cart total greater 5.00".match(/^.*(?=cart total).*(?=(greater|less)).*(?=\$([0-9.]+))/)

get me "greater" , ""

i realize lookahead searching specifcally "$" in group taking out causes not find amount, i'd love see how modify find amount regardless of presence of "$" or not.

thanks!

the lookahead not necessary in case. improved dollar matching match commas in number, e.g., $1,000.00, , without commas / decimal points, e.g., $10.

regex = /cart total (greater|less) \$?((?:\d+,?)+(?:.\d+)?)/  strings = [   "cart total greater 5.00",   "cart total less $1,500,000.00",   "cart total greater $5" ]  strings.each |string|   p string.match(regex) end  #<matchdata "cart total greater 5.00" 1:"greater" 2:"5.00"> #<matchdata "cart total less $1,500,000.00" 1:"less" 2:"1,500,000.00"> #<matchdata "cart total greater $5" 1:"greater" 2:"5">

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