You need to apply a regex match but the pattern depend about each line in your file, and as you said, looping through this will be slow, but /filter might be faster than a while.Use filter -k to match all line first, and then use $regex in the alias that will be called to know if it's an exactly match (replace the space by .+ and escape all the period in the line).I don't think there is a better way to do this.
