UnboundedLookBehindException

reb4s

Unicode

CharClass

UnicodeCase

Flag

Union

charclass

UnixLines

Flag

Upper

Posix

UpperCase

Java

Uppercase

Letter

unary_~

CharClass

unboundedExpression

UnboundedLookBehindException

unescaped

Literal CharLiteral StringLiteral

unescapedChar

CharLiteral

union

CharClass MultiChar SingleChar

unitableForm

CharClass CharRange Intersection MultiChar NamedPredefinedClass Negated PredefinedClass SingleChar Union