Add parseCharacterRanges function to Strings.php and tests

Parses character ranges like A-Z into individual characters and returns as an array

www/admin/class_test.strings.php

@@ -140,6 +140,27 @@ $preg_error = Strings::isValidRegex($regex_string);
 print "[B] LAST PREGE ERROR: " . preg_last_error() . " -> "
 	. Strings::getLastRegexErrorString() . " -> " . preg_last_error_msg() . "<br>";
 
+$base_strings = [
+	'A-Z',
+	'a-z',
+	'A-Za-z',
+	'A-Df-g',
+	'A-D0-9',
+	'D-A7-0',
+	'A-FB-G',
+	'0-9',
+	'あ-お',
+	'ア-オ',
+];
+foreach ($base_strings as $string) {
+	try {
+		$parsed = Strings::parseCharacterRanges($string);
+		print "Parsed ranges for '$string': " . DgS::printAr($parsed) . "<br>";
+	} catch (\InvalidArgumentException $e) {
+		print "Error parsing ranges for '$string': " . $e->getMessage() . "<br>";
+	}
+}
+
 print "</body></html>";
 
 // __END__

www/lib/CoreLibs/Convert/Strings.php

@@ -268,6 +268,51 @@ class Strings
 		));
 	}
 
+	/**
+	 * Split up character ranges in format A-Z, a-z, 0-9
+	 *
+	 * @param  string $input
+	 * @return string[]
+	 */
+	public static function parseCharacterRanges(string $input): array
+	{
+		// if not alphanumeric, throw value error
+		if (!preg_match("/^[A-Za-z0-9\-\s]+$/u", $input)) {
+			throw new \InvalidArgumentException(
+				"The input string contains invalid characters, "
+				. "only alphanumeric, dash (-), space and 'or' are allowed: "
+				. $input
+			);
+		}
+		// Remove all spaces
+		$input = str_replace(' ', '', $input);
+		$result = [];
+		// Find all patterns like "A-Z" (character-dash-character)
+		preg_match_all('/(.)-(.)/u', $input, $matches, PREG_SET_ORDER);
+		foreach ($matches as $match) {
+			$start = $match[1];
+			$end = $match[2];
+			// Get ASCII/Unicode values
+			$startOrd = ord($start[0]);
+			$endOrd = ord($end[0]);
+			// make sure start is before end
+			if ($startOrd > $endOrd) {
+				[$startOrd, $endOrd] = [$endOrd, $startOrd];
+			}
+
+			// Generate range of characters
+			for ($i = $startOrd; $i <= $endOrd; $i++) {
+				$char = chr($i);
+				if (!in_array($char, $result)) {
+					$result[] = $char;
+				}
+			}
+		}
+		// make the result unique
+		$result = array_unique($result);
+		return $result;
+	}
+
 	/**
 	 * Check if a regex is valid. Does not return the detail regex parser error
 	 *