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- regExp ::= branch ('|' branch)* >Regular Expression (branch|branch|...)
- branch$ ::= piece+ >Branch (piece+)
- piece$ ::= atom quantifier? >Piece (atom quantifier?)
- quantifier$ ::= [?*+] | ( '{' quantity '}' ) >Piece quantifier (? | * | + | {quantity})
- quantity$ ::= quantRange | quantMin | QuantExact >Numeric quantity
- quantRange$ ::= QuantExact ',' QuantExact >Quantity range {n,m}
- quantMin$ ::= QuantExact ',' >Minimum quantity {n,}
- QuantExact$ ::= [0-9]+ >Exact quantity {n}
- atom$ ::= Char | charClass | ( '(' regExp ')' ) >Atom (char | charclass | (regexp))
- Char$ ::= [^.\?*+()|#x5B#x5D] >Normal character (any non-metacharacter)
- charClass ::= charClassEsc | charClassExpr >Character class (escape | expression)
- charClassExpr$ ::= '[' charGroup ']' >Character class expression ( [charGroup] )
- charGroup ::= charClassSub | negCharGroup | posCharGroup >Character group
- charClassSub$ ::= ( posCharGroupND | negCharGroupND ) '-' charClassExpr >Character class subtraction
- negCharGroup$ ::= '^' posCharGroup >Negative character group
- negCharGroupND$ ::= '^' posCharGroupND >Negative character group
- posCharGroup$ ::= ( charRange | charClassEsc )+ >Positive character group (character range | character class escape)+
- posCharGroupND$ ::= ( XmlCharRef | XmlChar | charClassEsc )+ >Positive character group (character range | character class escape)+
- charRange$ ::= seRange | XmlCharRef | XmlCharIncDash >Character range (XML character|s-e range)
- seRange$ ::= charOrEsc '-' charOrEsc >s-e character range
- charOrEsc$ ::= XmlChar | SingleCharEsc >XML character or single-character escape
- XmlChar$ ::= [^\#x2D#x5B#x5D] >XML character (all except \-[])
- XmlCharIncDash$ ::= [^\#x5B#x5D] >XML character (all except \[])
- XmlCharRef ::= ('' [0-9]+ ';') | ('' [0-9a-fA-F]+ ';') >Character-Reference (Ù or ê)
- charClassEsc ::= ( SingleCharEsc | MultiCharEsc | catEsc | complEsc ) >Character class escape
- SingleCharEsc ::= '\' [nrt\.?*+()|{}#x2D#x5B#x5D#x5E] >Single character escape
- MultiCharEsc ::= '.' | ('\' [sSiIcCdDwW]) >Multi-character escape
- catEsc$ ::= '\p{' charProp '}' >Category escape
- complEsc$ ::= '\P{' charProp '}' >Category escape compliment
- charProp$ ::= Letters | Marks | Numbers | Punctuation | Separators | Symbols | Other | IsBlock >Unicode character property
- IsBlock ::= 'Is' [a-zA-Z]+ >Unicode block name
- Letters ::= 'L' [ultmo]? >Unicode letters category
- Marks ::= 'M' [nce]? >Unicode marks category
- Numbers ::= 'N' [dlo]? >Unicode numbers category
- Punctuation ::= 'P' [cdseifo]? >Unicode punctuation category
- Separators ::= 'Z' [slp]? >Unicode separators category
- Symbols ::= 'S' [mcko]? >Unicode symbols category
- Other ::= 'C' [cfson]? >Unicode other category
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