TPRegexp Class Reference

Definition at line 36 of file TPRegexp.h.

Public Member Functions
	TPRegexp ()
	Default ctor.
	TPRegexp (const TPRegexp &p)
	Copy ctor.
	TPRegexp (const TString &pat)
	Create and initialize with pat.
virtual	~TPRegexp ()
	Cleanup.
TString	GetModifiers () const
	Return PCRE modifier options as string.
TString	GetPattern () const
Bool_t	IsValid () const
	Returns true if underlying PCRE structure has been successfully generated via regexp compilation.
Int_t	Match (const TString &s, const TString &mods="", Int_t start=0, Int_t nMaxMatch=10, TArrayI *pos=0)
	The number of matches is returned, this equals the full match + sub-pattern matches.
Bool_t	MatchB (const TString &s, const TString &mods="", Int_t start=0, Int_t nMaxMatch=10)
TObjArray *	MatchS (const TString &s, const TString &mods="", Int_t start=0, Int_t nMaxMatch=10)
	Returns a TObjArray of matched substrings as TObjString's.
TPRegexp &	operator= (const TPRegexp &p)
	Assignment operator.
Int_t	Substitute (TString &s, const TString &replace, const TString &mods="", Int_t start=0, Int_t nMatchMax=10)
	Substitute replaces the string s by a new string in which matching patterns are replaced by the replacePattern string.

Static Public Member Functions
static Bool_t	GetThrowAtCompileError ()
	Get value of static flag controlling whether exception should be thrown upon an error during regular expression compilation by the PCRE engine.
static void	SetThrowAtCompileError (Bool_t throwp)
	Set static flag controlling whether exception should be thrown upon an error during regular expression compilation by the PCRE engine.

Protected Types
enum	{ kPCRE_GLOBAL = 0x80000000 , kPCRE_OPTIMIZE = 0x40000000 , kPCRE_DEBUG_MSGS = 0x20000000 , kPCRE_INTMASK = 0x0FFF }

Protected Member Functions
void	Compile ()
	Compile the fPattern.
Int_t	MatchInternal (const TString &s, Int_t start, Int_t nMaxMatch, TArrayI *pos=0) const
	Perform the actual matching - protected method.
void	Optimize ()
	Send the pattern through the optimizer.
UInt_t	ParseMods (const TString &mods) const
	Translate Perl modifier flags into pcre flags.
Int_t	ReplaceSubs (const TString &s, TString &final, const TString &replacePattern, Int_t *ovec, Int_t nmatch) const
	Returns the number of expanded '$' constructs.
Int_t	SubstituteInternal (TString &s, const TString &replace, Int_t start, Int_t nMaxMatch0, Bool_t doDollarSubst) const
	Perform pattern substitution with optional back-ref replacement.

Protected Attributes
TString	fPattern
UInt_t	fPCREOpts
PCREPriv_t *	fPriv

Static Protected Attributes
static Bool_t	fgThrowAtCompileError = kFALSE

#include <TPRegexp.h>

Inheritance diagram for TPRegexp:

Member Enumeration Documentation

anonymous enum

anonymous enum

protected

Enumerator
kPCRE_GLOBAL
kPCRE_OPTIMIZE
kPCRE_DEBUG_MSGS
kPCRE_INTMASK

Definition at line 39 of file TPRegexp.h.

Constructor & Destructor Documentation

TPRegexp() [1/3]

TPRegexp::TPRegexp

(

)

Default ctor.

Definition at line 51 of file TPRegexp.cxx.

TPRegexp() [2/3]

TPRegexp::TPRegexp

(

const TString &

pat

)

Create and initialize with pat.

Definition at line 60 of file TPRegexp.cxx.

TPRegexp() [3/3]

TPRegexp::TPRegexp

(

const TPRegexp &

p

)

Copy ctor.

Definition at line 70 of file TPRegexp.cxx.

~TPRegexp()

TPRegexp::~TPRegexp ( )

virtual

Cleanup.

Definition at line 80 of file TPRegexp.cxx.

Member Function Documentation

Compile()

void TPRegexp::Compile ( )

protected

Compile the fPattern.

Definition at line 198 of file TPRegexp.cxx.

GetModifiers()

TString TPRegexp::GetModifiers

(

)

const

Return PCRE modifier options as string.

For meaning of mods see ParseMods().

Definition at line 180 of file TPRegexp.cxx.

GetPattern()

TString TPRegexp::GetPattern ( ) const

inline

Definition at line 85 of file TPRegexp.h.

GetThrowAtCompileError()

Bool_t TPRegexp::GetThrowAtCompileError ( )

static

Get value of static flag controlling whether exception should be thrown upon an error during regular expression compilation by the PCRE engine.

Definition at line 497 of file TPRegexp.cxx.

IsValid()

Bool_t TPRegexp::IsValid

(

)

const

Returns true if underlying PCRE structure has been successfully generated via regexp compilation.

Definition at line 488 of file TPRegexp.cxx.

Match()

Int_t TPRegexp::Match	(	const TString &	s,
		const TString &	mods = "",
		Int_t	start = 0,
		Int_t	nMaxMatch = 10,
		TArrayI *	pos = 0
	)

The number of matches is returned, this equals the full match + sub-pattern matches.

nMaxMatch is the maximum allowed number of matches. pos contains the string indices of the matches. Its usage is shown in the routine MatchS. For meaning of mods see ParseMods().

Definition at line 339 of file TPRegexp.cxx.

MatchB()

Bool_t TPRegexp::MatchB ( const TString &  s, const TString &  mods = "", Int_t  start = 0, Int_t  nMaxMatch = 10  )

inline

Definition at line 78 of file TPRegexp.h.

MatchInternal()

Int_t TPRegexp::MatchInternal ( const TString &  s, Int_t  start, Int_t  nMaxMatch, TArrayI *  pos = 0  ) const

protected

Perform the actual matching - protected method.

Definition at line 307 of file TPRegexp.cxx.

MatchS()

TObjArray * TPRegexp::MatchS	(	const TString &	s,
		const TString &	mods = "",
		Int_t	start = 0,
		Int_t	nMaxMatch = 10
	)

Returns a TObjArray of matched substrings as TObjString's.

The TObjArray is owner of the objects and must be deleted by the user. The first entry is the full matched pattern, followed by the sub-patterns. If a pattern was not matched, it will return an empty substring:

TObjArray *subStrL = TPRegexp("(a|(z))(bc)").MatchS("abc");
for (Int_t i = 0; i < subStrL->GetLast()+1; i++) {
   const TString subStr = ((TObjString *)subStrL->At(i))->GetString();
   std::cout << "\"" << subStr << "\" ";
}
std::cout << subStr << std::endl;

produces: "abc" "a" "" "bc"

For meaning of mods see ParseMods().

Definition at line 370 of file TPRegexp.cxx.

operator=()

TPRegexp & TPRegexp::operator=

(

const TPRegexp &

p

)

Assignment operator.

Definition at line 92 of file TPRegexp.cxx.

Optimize()

void TPRegexp::Optimize ( )

protected

Send the pattern through the optimizer.

Definition at line 230 of file TPRegexp.cxx.

ParseMods()

UInt_t TPRegexp::ParseMods ( const TString &  modStr ) const

protected

Translate Perl modifier flags into pcre flags.

The supported modStr characters are: g, i, m, o, s, x, and the special d for debug. The meaning of the letters is:

• m Treat string as multiple lines. That is, change "^" and "$" from matching the start or end of the string to matching the start or end of any line anywhere within the string.
• s Treat string as single line. That is, change "." to match any character whatsoever, even a newline, which normally it would not match. Used together, as /ms, they let the "." match any character whatsoever, while still allowing "^" and "$" to match, respectively, just after and just before newlines within the string.
• i Do case-insensitive pattern matching.
• x Extend your pattern's legibility by permitting whitespace and comments.
• p Preserve the string matched such that ${^PREMATCH}, ${^MATCH}, and ${^POSTMATCH} are available for use after matching.
• g and c Global matching, and keep the Current position after failed matching. Unlike i, m, s and x, these two flags affect the way the regex is used rather than the regex itself. See Using regular expressions in Perl in perlretut for further explanation of the g and c modifiers. For more detail see: http://perldoc.perl.org/perlre.html#Modifiers.

Definition at line 135 of file TPRegexp.cxx.

ReplaceSubs()

Int_t TPRegexp::ReplaceSubs ( const TString &  s, TString &  final, const TString &  replacePattern, Int_t *  ovec, Int_t  nmatch  ) const

protected

Returns the number of expanded '$' constructs.

Definition at line 251 of file TPRegexp.cxx.

SetThrowAtCompileError()

void TPRegexp::SetThrowAtCompileError ( Bool_t  throwp )

static

Set static flag controlling whether exception should be thrown upon an error during regular expression compilation by the PCRE engine.

Definition at line 506 of file TPRegexp.cxx.

Substitute()

Int_t TPRegexp::Substitute	(	TString &	s,
		const TString &	replacePattern,
		const TString &	mods = "",
		Int_t	start = 0,
		Int_t	nMaxMatch = 10
	)

Substitute replaces the string s by a new string in which matching patterns are replaced by the replacePattern string.

The number of substitutions are returned.

TString s("aap noot mies");
const Int_t nrSub = TPRegexp("(\\w*) noot (\\w*)").Substitute(s,"$2 noot $1");
std::cout << nrSub << " \"" << s << "\"" <<std::endl;

produces: 2 "mies noot aap"

For meaning of mods see ParseMods().

Definition at line 470 of file TPRegexp.cxx.

SubstituteInternal()

Int_t TPRegexp::SubstituteInternal ( TString &  s, const TString &  replacePattern, Int_t  start, Int_t  nMaxMatch, Bool_t  doDollarSubst  ) const

protected

Perform pattern substitution with optional back-ref replacement.

• protected method.

Definition at line 396 of file TPRegexp.cxx.

Member Data Documentation

fgThrowAtCompileError

Bool_t TPRegexp::fgThrowAtCompileError = kFALSE

staticprotected

Definition at line 50 of file TPRegexp.h.

fPattern

TString TPRegexp::fPattern

protected

Definition at line 46 of file TPRegexp.h.

fPCREOpts

UInt_t TPRegexp::fPCREOpts

protected

Definition at line 48 of file TPRegexp.h.

fPriv

PCREPriv_t* TPRegexp::fPriv

protected

Definition at line 47 of file TPRegexp.h.