String.replaceAll variant that handles each match using closure

libraries/stdlib/src/kotlin/StringsJVM.kt

@@ -524,3 +524,29 @@ public inline fun String.trimTrailing(): String {
     }
     return if (count < this.length) substring(0, count) else this
 }
+
+/** 
+  * Replaces every *regexp* occurence in the text with the value retruned by the given function *body* that can handle 
+  * particular occurance using [[MatchResult]] provided.
+  */
+public fun String.replaceAll(regexp: String, body: (java.util.regex.MatchResult) -> String) : String {
+    val sb = StringBuilder(this.length())
+    val p = regexp.toRegex()
+    val m = p.matcher(this)
+
+    var lastIdx = 0
+    while (m.find()) {
+        sb.append(this, lastIdx, m.start())
+        sb.append(body(m.toMatchResult()))
+        lastIdx = m.end()
+    }	
+
+    if (lastIdx == 0) {
+        return this;
+    }
+
+    sb.append(this, lastIdx, this.length())
+
+    return sb.toString()
+}
+

libraries/stdlib/test/StringJVMTest.kt

@@ -295,4 +295,37 @@ class StringJVMTest {
         assertEquals(s.toByteArray().toString(), s.toByteArray(defaultCharset).toString())
         assertEquals(s.toByteArray().toString(), s.toByteArray(defaultCharset.name()).toString())
     }
+
+    test fun testReplaceAllClosure() {
+        val s = "test123zzz"
+        val result = s.replaceAll("\\d+") { (mr) ->
+            "[" + mr.group() + "]"
+        }
+        assertEquals("test[123]zzz", result)
+    }
+
+    test fun testReplaceAllClosureAtStart() {
+        val s = "123zzz"
+        val result = s.replaceAll("\\d+") { (mr) ->
+            "[" + mr.group() + "]"
+        }
+        assertEquals("[123]zzz", result)
+    }
+
+    test fun testReplaceAllClosureAtEnd() {
+        val s = "test123"
+        val result = s.replaceAll("\\d+") { (mr) ->
+            "[" + mr.group() + "]"
+        }
+        assertEquals("test[123]", result)
+    }
+
+    test fun testReplaceAllClosureEmpty() {
+        val s = ""
+        val result = s.replaceAll("\\d+") { (mr) ->
+            "x"
+        }
+        assertEquals("", result)
+
+    }
 }