[php] make EReg and unicode friends (#7419)

std/php/_std/EReg.hx

@@ -35,13 +35,9 @@ import php.*;
 
 	public function new( r : String, opt : String ) : Void {
 		this.pattern = r;
-		var a = opt.split("g");
-		global = a.length > 1;
-		if (global) {
-			opt = a.join("");
-		}
-		this.options = opt;
-		this.re = '"' + Global.str_replace('"', '\\"', r) + '"' + opt;
+		options = Global.str_replace('g', '', opt);
+		global = options != opt;
+		this.re = '"' + Global.str_replace('"', '\\"', r) + '"' + options;
 	}
 
 	public function match( s : String ) : Bool {
@@ -66,24 +62,24 @@ import php.*;
 
 	public function matchedLeft() : String {
 		if (Global.count(matches) == 0) throw "No string matched";
-		return last.substr(0, matches[0][1]);
+		return Global.substr(last, 0, matches[0][1]);
 	}
 
 	public function matchedRight() : String {
 		if (Global.count(matches) == 0) throw "No string matched";
 		var x : Int = (matches[0][1]:Int) + Global.strlen(matches[0][0]);
-		return last.substr(x);
+		return Global.substr(last, x);
 	}
 
 	public function matchedPos() : { pos : Int, len : Int } {
 		return {
-			pos : matches[0][1],
-			len : Global.strlen(matches[0][0])
+			pos : Global.mb_strlen(Global.substr(last, 0, matches[0][1])),
+			len : Global.mb_strlen(matches[0][0])
 		};
 	}
 
 	public function matchSub( s : String, pos : Int, len : Int = -1):Bool {
-		var subject = len < 0 ? s : s.substr(0,pos + len);
+		var subject = len < 0 ? s : s.substr(0, pos + len);
 		var p : Int = Global.preg_match(re, subject, matches, Const.PREG_OFFSET_CAPTURE, pos);
 		if(p > 0) {
 			last = s;

tests/unit/src/unitstd/Unicode.unit.hx

@@ -275,7 +275,7 @@ function test(left:String, middle:String, right:String) {
 	}), '${left}ä$right');
 }
 
-#if !(lua || cpp || php)
+#if !(lua || cpp)
 test("äb", "ä", "bc");
 test("äb", "a", "bc");
 test("ab", "a", "bc");