library: libCore #include "TRegexp.h"

# TRegexp

class description - source file - inheritance tree (.ps)

## class TRegexp

| Inheritance Chart:

`TRegexp`

        private:

                 void CopyPattern(const TRegexp& re)
                 void GenPattern(const char* re)
          const char* MakeWildcard(const char* re) const

        public:

                            TRegexp(const char* re, Bool_t wildcard = kFALSE)
                            TRegexp(const TString& re)
                            TRegexp(const TRegexp& re)
                    virtual ~TRegexp()
             static TClass* Class()
                     Ssiz_t Index(const TString& str, Ssiz_t* len, Ssiz_t start = 0) const
            virtual TClass* IsA() const
                   TRegexp& operator=(const TRegexp& re)
                   TRegexp& operator=(const TString& re)
                   TRegexp& operator=(const char* re)
               virtual void ShowMembers(TMemberInspector& insp, char* parent)
          TRegexp::EStatVal Status()
               virtual void Streamer(TBuffer& b)
                       void StreamerNVirtual(TBuffer& b)

### Data Members

        private:

                    unsigned short* fPattern  Compiled pattern
                  TRegexp::EStatVal fStat     Status
          static const unsigned int fgMaxpat  Max length of compiled pattern

        public:

          static const TRegexp::EStatVal kOK
          static const TRegexp::EStatVal kIllegal
          static const TRegexp::EStatVal kNomem
          static const TRegexp::EStatVal kToolong

## Class Description

     TRegexp

     Regular expression class.

       '^'             // start-of-line anchor
       '$'             // end-of-line anchor
       '.'             // matches any character
       '['             // start a character class
       ']'             // end a character class
       '^'             // negates character class if 1st character
       '*'             // Kleene closure (matches 0 or more)
       '+'             // Positive closure (1 or more)
       '?'             // Optional closure (0 or 1)

       Standard classes like [:alnum:], [:alpha:], etc. are not supported,
       only [a-zA-Z], [^ntf] and so on.

TRegexp(const char *re, Bool_t wildcard)

     Create a regular expression from the input string. If wildcard is true
     then the input string contains a wildcard expression (see MakeWildcard()).

TRegexp(const TString& re)

     Create a regular expression from a TString.

TRegexp(const TRegexp& r)

     Copy ctor.

~TRegexp()

void GenPattern(const char *str)

     Generate the regular expression pattern.

void CopyPattern(const TRegexp& r)

     Copy the regular expression pattern.

const char* MakeWildcard(const char *re)

     This routine transforms a wildcarding regular expression into
     a general regular expression used for pattern matching.
     When using wildcards the regular expression is assumed to be
     preceded by a "^" (BOL) and terminated by a "$" (EOL). Also, all
     "*"'s (closures) are assumed to be preceded by a "." (i.e. any character,
     except "/"'s) and all .'s are escaped (so *.ps is different from *.eps).
     The special treatment of "/" allows the easy matching of pathnames, e.g.
     "*.root" will match "aap.root", but not "pipo/aap.root".

Ssiz_t Index(const TString& string, Ssiz_t* len, Ssiz_t i) const

     Find the first occurance of the regexp in string and return the position.
     Len is length of the matched string and i is the offset at which the
     matching should start.

### Inline Functions

                     TRegexp& operator=(const TRegexp& re)
                     TRegexp& operator=(const TString& re)
                     TRegexp& operator=(const char* re)
            TRegexp::EStatVal Status()
                      TClass* Class()
                      TClass* IsA() const
                         void ShowMembers(TMemberInspector& insp, char* parent)
                         void Streamer(TBuffer& b)
                         void StreamerNVirtual(TBuffer& b)

Author: Fons Rademakers 04/08/95
Last update: root/base:$Name: $:$Id: TRegexp.cxx,v 1.11 2003/07/18 13:21:05 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *