regex: Refactor predefined character classes.

backend.native/tests/external/stdlib/text/RegexTest/harmony/AllCodePointsTest.kt

@@ -9,21 +9,15 @@ fun codePointToString(codePoint: Int): String {
     return fromCharArray(charArray, 0, charArray.size)
 }
 
-fun box() {}
-
 // TODO: Here is a performance problem: an execution of this test requires much more time than it in Kotlin/JVM.
-fun box1() {
+fun box() {
     // Regression for HARMONY-3145
     var p = Regex("(\\p{all})+")
     var res = true
     var cnt = 0
     var s: String
     for (i in 0..1114111) {
-        if (i % 200000 == 0) {
-            println(i)
-        }
         s = codePointToString(i)
-        // if (!s.matches(p.toString().toRegex())) { TODO: Uncomment when caching is done.
         if (!s.matches(p)) {
             cnt++
             res = false
@@ -37,11 +31,7 @@ fun box1() {
     cnt = 0
 
     for (i in 0..1114111) {
-        if (i % 200000 == 0) {
-            println(i)
-        }
         s = codePointToString(i)
-        // if (!s.matches(p.toString().toRegex())) { TODO: Uncomment when caching is done.
         if (!s.matches(p)) {
             cnt++
             res = false