Regular Expressions in JLex

• Apart from the special characters ? * + | ( )  $\!\!$ $ / ; . = < > [ ] { } " $\backslash$  and blank, every character stands for itself.
• After $\backslash$ the special characters lose their special meaning.
• Between double quotes " all special characters but $\backslash$ " lose their special meaning.
• The following escape sequences are recognized: $\backslash$b $\backslash$n $\backslash$t $\backslash$f $\backslash$r $\backslash$ddd $\backslash$xdd $\backslash$udddd $\backslash$ $\!\!$C $\backslash$c.
• | and () have the same meaning as in EBNF.
• {name} refers to the non-terminal name
• name = E is used to define non-terminals.
• E* is the same as EBNF { E }. ab* is the same as EBNF "a" { "b" }.
• E? is the same as EBNF [ E ].
• E+ is the same as EBNF E { E }.