Package net.sf.saxon.regex

Class REProgram

  • public class REProgram
extends java.lang.Object
    A class that holds compiled regular expressions.

    • Constructor Summary

      Constructors 
      Constructor Description
      REProgram​(Operation operation, int parens, REFlags flags)
      Constructs a program object from a character array

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getBacktrackingLimit()  
      UnicodeString getPrefix()
      Returns a copy of the prefix of current regular expression program in a character array.
      boolean isNullable()
      Ask whether the regular expression is known statically to match a zero length string
      void setBacktrackingLimit​(int limit)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • REProgram

        public REProgram​(Operation operation,
                 int parens,
                 REFlags flags)
        Constructs a program object from a character array
        Parameters:
        operation - Array with RE opcode instructions in it. The "next"
        parens - Count of parens in the program pointers within the operations must already have been converted to absolute offsets.
        flags - the regular expression flags

    • Method Detail

      • setBacktrackingLimit

        public void setBacktrackingLimit​(int limit)

      • getBacktrackingLimit

        public int getBacktrackingLimit()

      • isNullable

        public boolean isNullable()
        Ask whether the regular expression is known statically to match a zero length string
        Returns:
        true if the regex is known statically to match a zero length string. If the result is true, then there is definitely a match; if the result is false, then it is not known statically whether there is a match (this arises when the expression contains back-references).

      • getPrefix

        public UnicodeString getPrefix()
        Returns a copy of the prefix of current regular expression program in a character array. If there is no prefix, or there is no program compiled yet, getPrefix will return null.
        Returns:
        A copy of the prefix of current compiled RE program