string url = "www.google.com?cd=*|MMERGE25|*&mail=*|EMAIL|*&first=*|FNAME|*&last=*|LNAME|*&company=*|MMERGE4|*&cif=*|MMERGE58|*";
string urlNeeded = url.replace("www.google.com?", ""); //Es un replace, pero simplement li estic dient que ho remplaçi per res, aixi que es mes un "borrar"
//urlNeeded = cd=*|MMERGE25|*&mail=*|EMAIL|*&first=*|FNAME|*&last=*|LNAME|*&company=*|MMERGE4|*&cif=*|MMERGE58|*;
string cleaned = url.replace('&', '=');
//urlNeeded = cd=*|MMERGE25|*=mail=*|EMAIL|*=first=*|FNAME|*=last=*|LNAME|*=company=*|MMERGE4|*=cif=*|MMERGE58|*;
string[] splitted = url.split('=');
//splitted = [cd,*|MMERGE25|*,mail,*|EMAIL|*,first,*|FNAME|*,last,*|LNAME|*,company,*|MMERGE4|*,cif,*|MMERGE58|*];
//splitted[0] = "cd";
//splitted[1] = "*|MMERGE25|*";
//splitted[2] = "mail";
//splitted[3] = "*|EMAIL|*";
//etc.
int companyKeyIndex = splitted.indexOf("company");
//companyKeyIndex = 8;
int companyValueIndex = companyKeyIndex + 1;
//companyKeyIndex = 9;
string companyValue = splitted[companyValueIndex]
//companyValue = "*|MMERGE4|*"
string companyValueCleaned = companyValue.replace('*', ''); //El mateix que previament, es un replace pero enten-ho com borrar
//companyValueCleaned = "|MMERGE4|";
//si volguesis treure les barres tambe s'afegiria aquesta linia (sense crear una nova variable, utilitzant ja la que tens)
companyValueCleaned = companyValue.replace('|', '');
//companyValueCleaned = "MMERGE4";