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var s="abs((a1+a4)-a5)>d8+d9";
var reg = /(abs)(\()((?:[^\(\)]*(?:\([^\)\(]*\))[^\(\)]*)*)(\))/g;
s = s.replace(reg,"$1$3");
var s="abs((a1+a4)-a5)>d8+d9";
alert(s.replace(/\babs\((.*)\)/g,"abs $1 ")); //abs (a1+a4)-a5 >d8+d9
var s="abs((a1+a4)-a5)>d8+d9";
alert(s.replace(/(abs)\(([^\(]*\([^\)]*\)[^\)]*)\)/g,"$1 $2"));