ThelatestreleaseofTPerlRegExisfullycompatiblewiththeRegularExpressionsCoreunitinDelphiXE.FornewcodewritteninDelphi2010orearlier,usingthelatestreleaseofTPerlRegExisstronglyrecommended.IfyoulatermigrateyourcodetoDelphiXE,allyouhavetodoisreplacePerlRegEx