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Module xmlregexp from libxml2
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PrevxmlreaderUpAPI documentationHomeThe XML C parser and toolkit of GnomexmlsaveNext
basic API for libxml regular expressions handling used for XML Schemas and validation. 
Table of Contents
Structure xmlExpCtxt
struct _xmlExpCtxt
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The content of this structure is not made public by the API.
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Typedef xmlExpCtxt * xmlExpCtxtPtr
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Structure xmlExpNode
struct _xmlExpNode
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The content of this structure is not made public by the API.
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Typedef xmlExpNode * xmlExpNodePtr
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Enum xmlExpNodeType
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Structure xmlRegExecCtxt
struct _xmlRegExecCtxt
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The content of this structure is not made public by the API.
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Typedef xmlRegExecCtxt * xmlRegExecCtxtPtr
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Structure xmlRegexp
struct _xmlRegexp
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The content of this structure is not made public by the API.
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Typedef xmlRegexp * xmlRegexpPtr
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int	xmlExpCtxtNbCons		(xmlExpCtxtPtr ctxt)
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int	xmlExpCtxtNbNodes		(xmlExpCtxtPtr ctxt)
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void	xmlExpDump			(xmlBufferPtr buf, 
					 xmlExpNodePtr expr)
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xmlExpNodePtr	xmlExpExpDerive		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 xmlExpNodePtr sub)
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void	xmlExpFree			(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp)
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void	xmlExpFreeCtxt			(xmlExpCtxtPtr ctxt)
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int	xmlExpGetLanguage		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 const xmlChar ** langList, 
					 int len)
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int	xmlExpGetStart			(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 const xmlChar ** tokList, 
					 int len)
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int	xmlExpIsNillable		(xmlExpNodePtr exp)
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int	xmlExpMaxToken			(xmlExpNodePtr expr)
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xmlExpNodePtr	xmlExpNewAtom		(xmlExpCtxtPtr ctxt, 
					 const xmlChar * name, 
					 int len)
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xmlExpCtxtPtr	xmlExpNewCtxt		(int maxNodes, 
					 xmlDictPtr dict)
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xmlExpNodePtr	xmlExpNewOr		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr left, 
					 xmlExpNodePtr right)
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xmlExpNodePtr	xmlExpNewRange		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr subset, 
					 int min, 
					 int max)
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xmlExpNodePtr	xmlExpNewSeq		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr left, 
					 xmlExpNodePtr right)
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xmlExpNodePtr	xmlExpParse		(xmlExpCtxtPtr ctxt, 
					 const char * expr)
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void	xmlExpRef			(xmlExpNodePtr exp)
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xmlExpNodePtr	xmlExpStringDerive	(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 const xmlChar * str, 
					 int len)
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int	xmlExpSubsume			(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 xmlExpNodePtr sub)
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Function type: xmlRegExecCallbacks
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void	xmlRegExecCallbacks		(xmlRegExecCtxtPtr exec, 
					 const xmlChar * token, 
					 void * transdata, 
					 void * inputdata)
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int	xmlRegExecErrInfo		(xmlRegExecCtxtPtr exec, 
					 const xmlChar ** string, 
					 int * nbval, 
					 int * nbneg, 
					 xmlChar ** values, 
					 int * terminal)
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int	xmlRegExecNextValues		(xmlRegExecCtxtPtr exec, 
					 int * nbval, 
					 int * nbneg, 
					 xmlChar ** values, 
					 int * terminal)
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int	xmlRegExecPushString		(xmlRegExecCtxtPtr exec, 
					 const xmlChar * value, 
					 void * data)
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int	xmlRegExecPushString2		(xmlRegExecCtxtPtr exec, 
					 const xmlChar * value, 
					 const xmlChar * value2, 
					 void * data)
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void	xmlRegFreeExecCtxt		(xmlRegExecCtxtPtr exec)
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void	xmlRegFreeRegexp		(xmlRegexpPtr regexp)
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xmlRegExecCtxtPtr	xmlRegNewExecCtxt	(xmlRegexpPtr comp, 
						 xmlRegExecCallbacks callback, 
						 void * data)
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xmlRegexpPtr	xmlRegexpCompile	(const xmlChar * regexp)
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int	xmlRegexpExec			(xmlRegexpPtr comp, 
					 const xmlChar * content)
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int	xmlRegexpIsDeterminist		(xmlRegexpPtr comp)
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void	xmlRegexpPrint			(FILE * output, 
					 xmlRegexpPtr regexp)
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Description
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Structure xmlExpCtxt
Structure xmlExpCtxt
struct _xmlExpCtxt {
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The content of this structure is not made public by the API.
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}
Structure xmlExpNode
Structure xmlExpNode
struct _xmlExpNode {
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The content of this structure is not made public by the API.
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}
Enum xmlExpNodeType
Enum xmlExpNodeType {
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    XML_EXP_EMPTY = 0
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    XML_EXP_FORBID = 1
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    XML_EXP_ATOM = 2
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    XML_EXP_SEQ = 3
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    XML_EXP_OR = 4
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    XML_EXP_COUNT = 5
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}
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Structure xmlRegExecCtxt
Structure xmlRegExecCtxt
struct _xmlRegExecCtxt {
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The content of this structure is not made public by the API.
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}
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      A libxml progressive regular expression evaluation context
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Structure xmlRegexp
Structure xmlRegexp
struct _xmlRegexp {
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The content of this structure is not made public by the API.
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}
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      A libxml regular expression, they can actually be far more complex thank the POSIX regex expressions.
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Function: xmlExpCtxtNbCons
int	xmlExpCtxtNbCons		(xmlExpCtxtPtr ctxt)
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Debugging facility provides the number of allocated nodes over lifetime
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<tt>ctxt</tt>:an expression context
<tt>Returns</tt>:the number of nodes ever allocated or -1 in case of error
Function: xmlExpCtxtNbNodes
int	xmlExpCtxtNbNodes		(xmlExpCtxtPtr ctxt)
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Debugging facility provides the number of allocated nodes at a that point
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<tt>ctxt</tt>:an expression context
<tt>Returns</tt>:the number of nodes in use or -1 in case of error
Function: xmlExpDump
void	xmlExpDump			(xmlBufferPtr buf, 
					 xmlExpNodePtr expr)
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Serialize the expression as compiled to the buffer
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<tt>buf</tt>:a buffer to receive the output
<tt>expr</tt>:the compiled expression
Function: xmlExpExpDerive
xmlExpNodePtr	xmlExpExpDerive		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 xmlExpNodePtr sub)
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Evaluates the expression resulting from @exp consuming a sub expression @sub Based on algebraic derivation and sometimes direct Brzozowski derivation it usually tatkes less than linear time and can handle expressions generating infinite languages.
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<tt>ctxt</tt>:the expressions context
<tt>exp</tt>:the englobing expression
<tt>sub</tt>:the subexpression
<tt>Returns</tt>:the resulting expression or NULL in case of internal error, the result must be freed
Function: xmlExpFree
void	xmlExpFree			(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp)
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Dereference the expression
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<tt>ctxt</tt>:the expression context
<tt>exp</tt>:the expression
Function: xmlExpFreeCtxt
void	xmlExpFreeCtxt			(xmlExpCtxtPtr ctxt)
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Free an expression context
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<tt>ctxt</tt>:an expression context
Function: xmlExpGetLanguage
int	xmlExpGetLanguage		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 const xmlChar ** langList, 
					 int len)
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Find all the strings used in @exp and store them in @list
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<tt>ctxt</tt>:the expression context
<tt>exp</tt>:the expression
<tt>langList</tt>:where to store the tokens
<tt>len</tt>:the allocated length of @list
<tt>Returns</tt>:the number of unique strings found, -1 in case of errors and -2 if there is more than @len strings
Function: xmlExpGetStart
int	xmlExpGetStart			(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 const xmlChar ** tokList, 
					 int len)
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Find all the strings that appears at the start of the languages accepted by @exp and store them in @list. E.g. for (a, b) | c it will return the list [a, c]
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<tt>ctxt</tt>:the expression context
<tt>exp</tt>:the expression
<tt>tokList</tt>:where to store the tokens
<tt>len</tt>:the allocated length of @list
<tt>Returns</tt>:the number of unique strings found, -1 in case of errors and -2 if there is more than @len strings
Function: xmlExpIsNillable
int	xmlExpIsNillable		(xmlExpNodePtr exp)
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Finds if the expression is nillable, i.e. if it accepts the empty sequqnce
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<tt>exp</tt>:the expression
<tt>Returns</tt>:1 if nillable, 0 if not and -1 in case of error
Function: xmlExpMaxToken
int	xmlExpMaxToken			(xmlExpNodePtr expr)
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Indicate the maximum number of input a expression can accept
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<tt>expr</tt>:a compiled expression
<tt>Returns</tt>:the maximum length or -1 in case of error
Function: xmlExpNewAtom
xmlExpNodePtr	xmlExpNewAtom		(xmlExpCtxtPtr ctxt, 
					 const xmlChar * name, 
					 int len)
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Get the atom associated to this name from that context
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<tt>ctxt</tt>:the expression context
<tt>name</tt>:the atom name
<tt>len</tt>:the atom name length in byte (or -1);
<tt>Returns</tt>:the node or NULL in case of error
Function: xmlExpNewCtxt
xmlExpCtxtPtr	xmlExpNewCtxt		(int maxNodes, 
					 xmlDictPtr dict)
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Creates a new context for manipulating expressions
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<tt>maxNodes</tt>:the maximum number of nodes
<tt>dict</tt>:optional dictionary to use internally
<tt>Returns</tt>:the context or NULL in case of error
Function: xmlExpNewOr
xmlExpNodePtr	xmlExpNewOr		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr left, 
					 xmlExpNodePtr right)
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Get the atom associated to the choice @left | @right Note that @left and @right are consumed in the operation, to keep an handle on them use xmlExpRef() and use xmlExpFree() to release them, this is true even in case of failure (unless ctxt == NULL).
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<tt>ctxt</tt>:the expression context
<tt>left</tt>:left expression
<tt>right</tt>:right expression
<tt>Returns</tt>:the node or NULL in case of error
Function: xmlExpNewRange
xmlExpNodePtr	xmlExpNewRange		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr subset, 
					 int min, 
					 int max)
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Get the atom associated to the range (@subset){@min, @max} Note that @subset is consumed in the operation, to keep an handle on it use xmlExpRef() and use xmlExpFree() to release it, this is true even in case of failure (unless ctxt == NULL).
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<tt>ctxt</tt>:the expression context
<tt>subset</tt>:the expression to be repeated
<tt>min</tt>:the lower bound for the repetition
<tt>max</tt>:the upper bound for the repetition, -1 means infinite
<tt>Returns</tt>:the node or NULL in case of error
Function: xmlExpNewSeq
xmlExpNodePtr	xmlExpNewSeq		(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr left, 
					 xmlExpNodePtr right)
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Get the atom associated to the sequence @left , @right Note that @left and @right are consumed in the operation, to keep an handle on them use xmlExpRef() and use xmlExpFree() to release them, this is true even in case of failure (unless ctxt == NULL).
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<tt>ctxt</tt>:the expression context
<tt>left</tt>:left expression
<tt>right</tt>:right expression
<tt>Returns</tt>:the node or NULL in case of error
Function: xmlExpParse
xmlExpNodePtr	xmlExpParse		(xmlExpCtxtPtr ctxt, 
					 const char * expr)
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Minimal parser for regexps, it understand the following constructs - string terminals - choice operator | - sequence operator , - subexpressions (...) - usual cardinality operators + * and ? - finite sequences { min, max } - infinite sequences { min, * } There is minimal checkings made especially no checking on strings values
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<tt>ctxt</tt>:the expressions context
<tt>expr</tt>:the 0 terminated string
<tt>Returns</tt>:a new expression or NULL in case of failure
Function: xmlExpRef
void	xmlExpRef			(xmlExpNodePtr exp)
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Increase the reference count of the expression
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<tt>exp</tt>:the expression
Function: xmlExpStringDerive
xmlExpNodePtr	xmlExpStringDerive	(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 const xmlChar * str, 
					 int len)
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Do one step of Brzozowski derivation of the expression @exp with respect to the input string
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<tt>ctxt</tt>:the expression context
<tt>exp</tt>:the expression
<tt>str</tt>:the string
<tt>len</tt>:the string len in bytes if available
<tt>Returns</tt>:the resulting expression or NULL in case of internal error
Function: xmlExpSubsume
int	xmlExpSubsume			(xmlExpCtxtPtr ctxt, 
					 xmlExpNodePtr exp, 
					 xmlExpNodePtr sub)
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Check whether @exp accepts all the languages accexpted by @sub the input being a subexpression.
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<tt>ctxt</tt>:the expressions context
<tt>exp</tt>:the englobing expression
<tt>sub</tt>:the subexpression
<tt>Returns</tt>:1 if true 0 if false and -1 in case of failure.
Function type: xmlRegExecCallbacks
Function type: xmlRegExecCallbacks
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void	xmlRegExecCallbacks		(xmlRegExecCtxtPtr exec, 
					 const xmlChar * token, 
					 void * transdata, 
					 void * inputdata)
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Callback function when doing a transition in the automata
<tt>exec</tt>:the regular expression context
<tt>token</tt>:the current token string
<tt>transdata</tt>:transition data
<tt>inputdata</tt>:input data
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Function: xmlRegExecErrInfo
int	xmlRegExecErrInfo		(xmlRegExecCtxtPtr exec, 
					 const xmlChar ** string, 
					 int * nbval, 
					 int * nbneg, 
					 xmlChar ** values, 
					 int * terminal)
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Extract error informations from the regexp execution, the parameter @string will be updated with the value pushed and not accepted, the parameter @values must point to an array of @nbval string pointers on return nbval will contain the number of possible strings in that state and the @values array will be updated with them. The string values
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<tt>exec</tt>:a regexp execution context generating an error
<tt>string</tt>:return value for the error string
<tt>nbval</tt>:pointer to the number of accepted values IN/OUT
<tt>nbneg</tt>:return number of negative transitions
<tt>values</tt>:pointer to the array of acceptable values
<tt>terminal</tt>:return value if this was a terminal state
<tt>Returns</tt>:will be freed with the @exec context and don't need to be deallocated. Returns: 0 in case of success or -1 in case of error.
Function: xmlRegExecNextValues
int	xmlRegExecNextValues		(xmlRegExecCtxtPtr exec, 
					 int * nbval, 
					 int * nbneg, 
					 xmlChar ** values, 
					 int * terminal)
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Extract informations from the regexp execution, the parameter @values must point to an array of @nbval string pointers on return nbval will contain the number of possible strings in that state and the @values array will be updated with them. The string values
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<tt>exec</tt>:a regexp execution context
<tt>nbval</tt>:pointer to the number of accepted values IN/OUT
<tt>nbneg</tt>:return number of negative transitions
<tt>values</tt>:pointer to the array of acceptable values
<tt>terminal</tt>:return value if this was a terminal state
<tt>Returns</tt>:will be freed with the @exec context and don't need to be deallocated. Returns: 0 in case of success or -1 in case of error.
Function: xmlRegExecPushString
int	xmlRegExecPushString		(xmlRegExecCtxtPtr exec, 
					 const xmlChar * value, 
					 void * data)
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Push one input token in the execution context
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<tt>exec</tt>:a regexp execution context or NULL to indicate the end
<tt>value</tt>:a string token input
<tt>data</tt>:data associated to the token to reuse in callbacks
<tt>Returns</tt>:1 if the regexp reached a final state, 0 if non-final, and a negative value in case of error.
Function: xmlRegExecPushString2
int	xmlRegExecPushString2		(xmlRegExecCtxtPtr exec, 
					 const xmlChar * value, 
					 const xmlChar * value2, 
					 void * data)
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Push one input token in the execution context
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<tt>exec</tt>:a regexp execution context or NULL to indicate the end
<tt>value</tt>:the first string token input
<tt>value2</tt>:the second string token input
<tt>data</tt>:data associated to the token to reuse in callbacks
<tt>Returns</tt>:1 if the regexp reached a final state, 0 if non-final, and a negative value in case of error.
Function: xmlRegFreeExecCtxt
void	xmlRegFreeExecCtxt		(xmlRegExecCtxtPtr exec)
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Free the structures associated to a regular expression evaulation context.
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<tt>exec</tt>:a regular expression evaulation context
Function: xmlRegFreeRegexp
void	xmlRegFreeRegexp		(xmlRegexpPtr regexp)
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Free a regexp
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<tt>regexp</tt>:the regexp
Function: xmlRegNewExecCtxt
xmlRegExecCtxtPtr	xmlRegNewExecCtxt	(xmlRegexpPtr comp, 
						 xmlRegExecCallbacks callback, 
						 void * data)
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Build a context used for progressive evaluation of a regexp.
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<tt>comp</tt>:a precompiled regular expression
<tt>callback</tt>:a callback function used for handling progresses in the automata matching phase
<tt>data</tt>:the context data associated to the callback in this context
<tt>Returns</tt>:the new context
Function: xmlRegexpCompile
xmlRegexpPtr	xmlRegexpCompile	(const xmlChar * regexp)
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Parses a regular expression conforming to XML Schemas Part 2 Datatype Appendix F and builds an automata suitable for testing strings against that regular expression
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<tt>regexp</tt>:a regular expression string
<tt>Returns</tt>:the compiled expression or NULL in case of error
Function: xmlRegexpExec
int	xmlRegexpExec			(xmlRegexpPtr comp, 
					 const xmlChar * content)
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Check if the regular expression generates the value
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<tt>comp</tt>:the compiled regular expression
<tt>content</tt>:the value to check against the regular expression
<tt>Returns</tt>:1 if it matches, 0 if not and a negative value in case of error
Function: xmlRegexpIsDeterminist
int	xmlRegexpIsDeterminist		(xmlRegexpPtr comp)
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Check if the regular expression is determinist
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<tt>comp</tt>:the compiled regular expression
<tt>Returns</tt>:1 if it yes, 0 if not and a negative value in case of error
Function: xmlRegexpPrint
void	xmlRegexpPrint			(FILE * output, 
					 xmlRegexpPtr regexp)
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Print the content of the compiled regular expression
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<tt>output</tt>:the file for the output debug
<tt>regexp</tt>:the compiled regexp
Daniel Veillard
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