[Boost-users] REG_PERLEX

Does anyone know the definition of REG_PERLEX? I am using the regex/regcomp traditional unix/posix API supported by Boost Regular Expression library. On a Windows 32 bit platform we are forced to use REG_PERLEX on the regcomp flags argument whereas for the same application we get by using a zero flag value on regcomp on platforms: Mac OS X and Linux. Thanks, phil phystad@mac.com