Fix regex in KotlinPluginCompatibilityVerifier to support release and milestones

idea/tests/org/jetbrains/kotlin/test/CompatibilityVerifierVersionComparisonTest.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.test
 
 import com.intellij.testFramework.LightPlatformTestCase
+import org.jetbrains.kotlin.idea.KotlinPluginUtil
 import org.jetbrains.kotlin.idea.KotlinPluginVersion
 import org.jetbrains.kotlin.idea.PlatformVersion
 import org.junit.runner.RunWith
@@ -16,6 +17,7 @@ class CompatibilityVerifierVersionComparisonTest : LightPlatformTestCase() {
         val version = KotlinPluginVersion.parse("1.2.40-dev-193-Studio3.0-1") ?: throw AssertionError("Version should not be null")
 
         assertEquals("1.2.40", version.kotlinVersion)
+        assertNull(version.milestone)
         assertEquals("dev", version.status)
         assertEquals("193", version.buildNumber)
         assertEquals(PlatformVersion.Platform.ANDROID_STUDIO, version.platformVersion.platform)
@@ -23,7 +25,32 @@ class CompatibilityVerifierVersionComparisonTest : LightPlatformTestCase() {
         assertEquals("1", version.patchNumber)
     }
 
+    fun testReleaseVersionDoesntHaveBuildNumber() {
+        val version = KotlinPluginVersion.parse("1.2.40-release-Studio3.0-1") ?: throw AssertionError("Version should not be null")
+
+        assertNull(version.buildNumber)
+    }
+
+    fun testMilestoneVersion() {
+        val version = KotlinPluginVersion.parse("1.4-M1-eap-27-IJ2020.1-1") ?: throw AssertionError("Version should not be null")
+
+        assertEquals("1.4", version.kotlinVersion)
+        assertEquals("M1", version.milestone)
+        assertEquals("eap", version.status)
+        assertEquals("27", version.buildNumber)
+        assertEquals(PlatformVersion.Platform.IDEA, version.platformVersion.platform)
+        assertEquals("2020.1", version.platformVersion.version)
+        assertEquals("1", version.patchNumber)
+    }
+
     fun testPlatformVersionParsing() {
         PlatformVersion.getCurrent() ?: throw AssertionError("Version should not be null")
     }
+
+    fun testCurrentPluginVersionParsing() {
+        val pluginVersion = KotlinPluginUtil.getPluginVersion()
+        if (pluginVersion == "@snapshot@") return
+
+        assertNotNull("Can not parse current Kotlin Plugin version: $pluginVersion", KotlinPluginVersion.getCurrent())
+    }
 }