Fix false positives in CodeConformanceTest on identifiers like readCopyright

compiler/tests/org/jetbrains/kotlin/code/CodeConformanceTest.kt

@@ -163,6 +163,7 @@ class CodeConformanceTest : TestCase() {
         val filesWithUnlistedCopyrights = mutableListOf<String>()
         val root = File(".").absoluteFile
         val knownThirdPartyCode = loadKnownThirdPartyCodeList()
+        val copyrightRegex = Regex("""\bCopyright\b""")
         for (sourceFile in FileUtil.findFilesByMask(SOURCES_FILE_PATTERN, root)) {
             val relativePath = FileUtil.toSystemIndependentName(sourceFile.toRelativeString(root))
             if (COPYRIGHT_EXCLUDED_FILES_AND_DIRS.any { relativePath.startsWith(it) } ||
@@ -170,7 +171,7 @@ class CodeConformanceTest : TestCase() {
 
             sourceFile.useLines { lineSequence ->
                 for (line in lineSequence) {
-                    if ("Copyright" in line && "JetBrains" !in line) {
+                    if (copyrightRegex in line && "JetBrains" !in line) {
                         filesWithUnlistedCopyrights.add("$relativePath: $line")
                     }
                 }