Thanks Virgil

I am not sure if your suggestion works in the case of "Methionine = (S)-2-amino-4-(methylsulfanyl)-butanoic acid".  I suspect it would end up as "methylsulfanyl" but I haven't tested it yet.

Paul


On 12/12/2022 13:48, Virgil Bierschwale wrote:
you can do this to get the positions, and then just get what is between the
two positions.

store "Methionine = (S)-2-amino-4-(methylsulfanyl)-butanoic acid (2.13)" to
string
store '(' to left_str
store ')' to right_str

*acid2 = "Methionine = (S)-2-amino-4-(methylsulfanyl)-butanoic acid"

clear

? rat(left_str, string)
? rat(right_str, string)



On Mon, Dec 12, 2022 at 7:10 AM Paul Newton <[email protected]>
wrote:

Hi all

I've been very quiet for a while so I thought it was about time I chimed
in again. I have come across the use of a regex expression in another
language which works like this:

acid1 = "Methionine = (S)-2-amino-4-(methylsulfanyl)-butanoic acid (2.13)"
acid2 = "Methionine = (S)-2-amino-4-(methylsulfanyl)-butanoic acid"

NumberAtEnd:= proc(S::string)
description
      "Extract a parenthesized number, possibly containing periods, from
the end of a string":
local r;
      if StringTools:-RegMatch("\\(([0-9.]*)\\)$", S, r$2) then r else
FAIL fi
end proc:

NumberAtEnd(acid1) returns "2.13"
NumberAtEnd(acid2) returns "FAIL"

How can this be done in VFP?  Many thanks

Paul Newton
***

*



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