v1.16.9

ADDED:
* netx.IsPub
* encodingx/hexx

Rest are mostly small corrections and docs

regexpx/TODO

@@ -0,0 +1,57 @@
+- write a flag parser/converter for github.com/scorpionknifes/go-pcre (and github.com/GRbit/go-pcre) :
+----
+//	i  CASELESS
+//	m  MULTILINE
+//	s  DOTALL
+//	x  EXTENDED
+//	U  UNGREEDY
+//	8  UTF8  (non-standard flag letter; standard PCRE uses (*UTF8) outside (?...) syntax)
+//
+// Flags after a '-' inside group disable associated flag and are ignored
+// (applies inside the regex engine once prefix is stripped).
+//	pattern, flags := ParsePrefixFlags(`(?im)^hello`)
+//	re := pcre.MustCompile(pattern, flags)
+func ParsePrefixFlags(pattern string) (string, int) {
+	if !strings.HasPrefix(pattern, "(?") {
+		return pattern, 0
+	}
+
+	end := strings.IndexByte(pattern, ')')
+	if end < 0 {
+		return pattern, 0
+	}
+
+	inner := pattern[2:end] // everything between "(?" and ")"
+
+	for _, ch := range inner {
+		if !strings.ContainsRune("imsxU8-", ch) {
+			return pattern, 0
+		}
+	}
+
+	positive := inner
+	if dash := strings.IndexByte(inner, '-'); dash >= 0 {
+		positive = inner[:dash]
+	}
+
+	var flags int
+	for _, ch := range positive {
+		switch ch {
+		case 'i':
+			flags |= pcre.CASELESS
+		case 'm':
+			flags |= pcre.MULTILINE
+		case 's':
+			flags |= pcre.DOTALL
+		case 'x':
+			flags |= pcre.EXTENDED
+		case 'U':
+			flags |= pcre.UNGREEDY
+		case '8':
+			flags |= pcre.UTF8
+		}
+	}
+
+	return pattern[end+1:], flags
+}
+----