Find text from a file and set it as a variable in applescript?

I am trying to build a script that sends me updates and notifications from cex.io. Please keep on reading below, so I may guide you until the point I have trouble with.
The first simple script in this operation goes to cex.io's trading page for BTC/GHS. It records ands saves the text to a file every 4 seconds. It works great. It doesn't need to have safari refresh because the site pushes info to the browser live.
repeat
          set the webpage_content to ""
          tell application "Safari" to set the webpage_content to the text of document 1
          set theText to webpage_content
          set a to "Macintosh HD:Users:PRIVATE:Desktop:CEX:"
          set theFile to (open for access file ((a) & "CEXRaw") with write permission)
          write theText to theFile
          close access theFile
          delay 4
end repeat
And it returns this from the site to this main file every 4 seconds: (note I cut off a chunk from the bottom and the top of the file, because they are unimportant)
    GHS:
    0.05233439
    BTC:
    0.00000223
    NMC:
    0.00002939
    LTC:
    0.00000000
    GHS/BTC
    0.02362958 LTC/BTC
    0.02438131 NMC/BTC
    0.00597565 GHS/NMC
    3.96951800 BF1/BTC
    1.67000000 Fund Account
    GHS/BTC
    Last price:
    0.02362958
    Daily change:
    -0.00018042
    Today's open:
    0.02381000
    24h volume:
    73812.35539255
I now need an applescript to read that file, and return wanted values. But I'm lost on how to write it.
It needs to find the number under BTC, and set it as a variable.
It needs to find the number under GHS, and set it as a variable.
It needs to find the number under Last Price, and set it as a variable.
If anyone could script that really quick for me, or tell me how to do it, that would be amazing. Thank you so much!

Couldn't tell if you had any whitespace in the lines (i.e. is there a space before or after GHS:), so I used contains, not is. Also, if you have a line such as GHS/BTC with a colon GHS/BTC: then it will also fail (as contains "BTC:" would be true for BTC: and GHS/BTC:)
However, this will give you some guidance:
set a to "Macintosh HD:Users:PRIVATE:Desktop:CEX:CEXRaw"
set x to 0
set Names to paragraphs of (read file a)
repeat with nextLine in Names
          set x to x + 1
          if nextLine contains "BTC:" then
                    set BTC to item (x + 1) of Names
          else if nextLine contains "GHS:" then
                    set GHS to item (x + 1) of Names
          else if nextLine contains "Last Price:" then
                    set lastPrice to item (x + 1) of Names
          end if
end repeat

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