fix: Update number regex for Java

Reference:
https://docs.oracle.com/javase/specs/jls/se6/html/lexical.html#48272

Draft:

DecimalNumeral: 0|[1-9][0-9]*
HexNumeral: 0x[0-9a-f]+
OctalNumeral: 0[0-7]+

IntegerLiteral: 0|[1-9][0-9]*|0x[0-9a-f]+|0[0-7]+

ExponentPart: e[+-]?[0-9]+

DecimalFloatingPointLiteral:

1. [0-9]+\.[0-9]*(?:e[+-]?[0-9]+)?[fd]?
2. \.[0-9]+(?:e[+-]?[0-9]+)?[fd]?
3. [0-9]+(?:e[+-]?[0-9]+)[fd]?
4. [0-9]+(?:e[+-]?[0-9]+)?[fd]

HexadecimalFloatingPointLiteral:
(?:0x[0-9a-f]+\.?|0x[0-9a-f]*\.[0-9a-f]+)p[+-]?[0-9]+[fd]?

Number:
(?<=\b|\s|^)(?i)(?:(?:[0-9]+\.[0-9]*(?:e[+-]?[0-9]+)?[fd]?)|(?:\.[0-9]+(?:e[+-]?[0-9]+)?[fd]?)|(?:[0-9]+(?:e[+-]?[0-9]+)[fd]?)|(?:[0-9]+(?:e[+-]?[0-9]+)?[fd])|(?:(?:(?:0x[0-9a-f]+\.?)|(?:0x[0-9a-f]*\.[0-9a-f]+))p[+-]?[0-9]+[fd]?)|(?:0)|(?:[1-9][0-9]*)|(?:0x[0-9a-f]+)|(?:0[0-7]+))(?=\b|\s|$)

src/internal/QJavaHighlighter.cpp

@@ -44,7 +44,7 @@ QJavaHighlighter::QJavaHighlighter(QTextDocument* document) :
 
     // Numbers
     m_highlightRules.append({
-        QRegularExpression(R"((?<=\b|\s|^)(?i)(?:(?:(?:(?:(?:\d+(?:'\d+)*)?\.(?:\d+(?:'\d+)*)(?:e[+-]?(?:\d+(?:'\d+)*))?)|(?:(?:\d+(?:'\d+)*)\.(?:e[+-]?(?:\d+(?:'\d+)*))?)|(?:(?:\d+(?:'\d+)*)(?:e[+-]?(?:\d+(?:'\d+)*)))|(?:0x(?:[0-9a-f]+(?:'[0-9a-f]+)*)?\.(?:[0-9a-f]+(?:'[0-9a-f]+)*)(?:p[+-]?(?:\d+(?:'\d+)*)))|(?:0x(?:[0-9a-f]+(?:'[0-9a-f]+)*)\.?(?:p[+-]?(?:\d+(?:'\d+)*))))[lf]?)|(?:(?:(?:[1-9]\d*(?:'\d+)*)|(?:0[0-7]*(?:'[0-7]+)*)|(?:0x[0-9a-f]+(?:'[0-9a-f]+)*)|(?:0b[01]+(?:'[01]+)*))(?:u?l{0,2}|l{0,2}u?)))(?=\b|\s|$))"),
+        QRegularExpression(R"((?<=\b|\s|^)(?i)(?:(?:[0-9]+\.[0-9]*(?:e[+-]?[0-9]+)?[fd]?)|(?:\.[0-9]+(?:e[+-]?[0-9]+)?[fd]?)|(?:[0-9]+(?:e[+-]?[0-9]+)[fd]?)|(?:[0-9]+(?:e[+-]?[0-9]+)?[fd])|(?:(?:(?:0x[0-9a-f]+\.?)|(?:0x[0-9a-f]*\.[0-9a-f]+))p[+-]?[0-9]+[fd]?)|(?:0)|(?:[1-9][0-9]*)|(?:0x[0-9a-f]+)|(?:0[0-7]+))(?=\b|\s|$))"),
         "Number"
     });