Try something like
Names Default To Here(1);
// [{\!"ReqId\!":\!"200904\!",\!"PoolId\!":\!"2001\!"}]
txt = Get Clipboard();
// Write(txt);
tx = Substitute(txt,"\!"","\!\!\!"");
// write(tx);
txt2 = "\!"ReqId\!"";
// Write(txt2);
tx2 = Substitute(txt, "\!\!", "");
// Write(tx2);
tx3 = Substitute(Get Clipboard(), "\!\!", "");
// Write(tx3);
Reading about JMP's escape sequences can also be helpful Scripting Guide > JSL Building Blocks > JSL Syntax Rules
-Jarmo