! ======================================================================
! Syntax Highlighting Patterns for NEdit Extended Regular Expressions
! ======================================================================
!
! Author:    Christopher Conrad
! Release:   March 3, 2000 (original)
!
!-----------------------------------------------------------------------
! NOTE: These patterns WILL ONLY work with NEdit versions 5.1 and latter
!-----------------------------------------------------------------------
!
! To load:
!    1. Save this to a file
!    2. Start NEdit using the -import command line option
!        ex: nedit -import <name of this file>
!    3. To retain the patterns in your NEdit startup file...
!          Preferences -> Save Default... and click "OK".
!
! Abstract:
!    These patterns attempt to highlight extended regular expression
!    strings for use with NEdit.  The patterns are COMPLICATED because
!    I made an effort to highlight the syntax as robustly as possible
!    (regular expressions are hard enough.  If you going to use
!    highlighting to make them more readable you don't want wimpy
!    patterns.)
!
! Features:
!    o  Counting Quantifiers are only highlighted if the numbers
!       specified are within the range 0-65535.  Any number of leading
!       zeros are allowed.
!    o  Character classes properly handle escaped characters, shortcut
!       escapes, and numeric escapes to some degree.  Character ranges
!       and the special characters that if they appear at the very
!       beginning or end are handled properly.
!
! Limitations:
!    o  Escaped characters, shortcut escapes, and numeric escapes within
!       character classes are not distinguished with a subpattern style.
!       It was just to complicated.
!    o  Multiple quantifiers in a row are highlighted even though this
!       would be an error.
!    o  These patterns do not recognize replacement string syntax,
!       e.g. "&".
!    o  All patterns are pass-1 except "Match Themselves".  This
!       shouldn't be a problem since I don't expect this to be used on 4
!       MB regex files (knock-on-wood).
!    o  These patterns are for "raw" regex syntax.  If used for macro or
!       .nedit file regex specifications, the doubled backslashes (\\)
!       confuses theses patterns.
!
nedit.highlightPatterns:\
	regex:1:0{\n\
		Comments:"(?#This is a comment!)\\(\\?#[^)]*(?:\\)|$)":::Comment::\n\
		Literal Escape:"(?#Special chars that need escapes)\\\\[abefnrtv()\\[\\]<>{}.|^$*+?&\\\\]":::Preprocessor::\n\
		Shortcut Escapes:"(?#Shortcuts for common char classes)\\\\[dDlLsSwW]":::Character Const::\n\
		Backreferences:"(?#Internal regex backreferences)\\\\[1-9]":::Storage Type::\n\
		Word Delimiter:"(?#Special token to match NEdit [non]word-delimiters)\\\\[yY]":::Subroutine::\n\
		Numeric Escape:"(?#Negative lookahead is to exclude \\x0 and \\00)(?!\\\\[xX0]0*(?:[^\da-fA-F]|$))\\\\(?:[xX]0*[1-9a-fA-F][\\da-fA-F]?|0*[1-3]?[0-7]?[0-7])":::Numeric Const::\n\
		Quantifiers:"(?#Matches greedy and lazy quantifiers)[*+?]\\??":::Flag::\n\
		Counting Quantifiers:"(?#Properly limits range numbers to 0-65535)\\{(?:[0-5]?\\d?\\d?\\d?\\d|6[0-4]\\d\\d\\d|65[0-4]\\d\\d|655[0-2]\\d|6553[0-5])?(?:,(?:[0-5]?\\d?\\d?\\d?\\d|6[0-4]\\d\\d\\d|65[0-4]\\d\\d|655[0-2]\\d|6553[0-5])?)?\\}\\??":::Numeric Const::\n\
		Character Class:"(?#Handles escapes, char ranges, ^-] at beginning and - at end)\\[\\^?[-\\]]?(?:(?:\\\\(?:[abdeflnrstvwDLSW\\-()\\[\\]<>{}.|^$*+?&\\\\]|[xX0][\\da-fA-F]+)|[^\\\\\\]])(?:-(?:\\\\(?:[abdeflnrstvwDLSW\\-()\\[\\]<>{}.|^$*+?&\\\\]|[xX0][\\da-fA-F]+)|[^\\\\\\]]))?)*\\-?]":::Character Const::\n\
		Anchors:"(?#\\B is the ""not a word boundary"" anchor)[$^<>]|\\\\B":::Flag::\n\
		Parens and Alternation:"\\(?:\\?(?:[:=!iInN])|[()|]":::Keyword::\n\
		Match Themselves:"(?#Highlight chars left over which just match themselves).":::Text Comment::D\n\
	}
nedit.languageModes:\n\
	regex:.reg .regex:"\\(\\?[:#=!iInN].+\\)":None:Continuous:::