Export default regular expression

This will allow consumers to append reg-exp 'or' clauses to the
matching

Bug: 178699279
Change-Id: I7380aa702dd03cb99ef4edab481dc3166ea20e8b
diff --git a/src/main/java/com/android/tools/r8/retrace/RetraceOptions.java b/src/main/java/com/android/tools/r8/retrace/RetraceOptions.java
index a8e5394..4784f09 100644
--- a/src/main/java/com/android/tools/r8/retrace/RetraceOptions.java
+++ b/src/main/java/com/android/tools/r8/retrace/RetraceOptions.java
@@ -4,9 +4,10 @@
 
 package com.android.tools.r8.retrace;
 
+import static com.android.tools.r8.retrace.internal.StackTraceRegularExpressionParser.DEFAULT_REGULAR_EXPRESSION;
+
 import com.android.tools.r8.DiagnosticsHandler;
 import com.android.tools.r8.Keep;
-import com.android.tools.r8.retrace.internal.StackTraceRegularExpressionParser;
 
 /**
  * The base options for running retrace with support for continuously retrace strings without
@@ -60,13 +61,17 @@
     return new Builder(diagnosticsHandler);
   }
 
+  public static String defaultRegularExpression() {
+    return DEFAULT_REGULAR_EXPRESSION;
+  }
+
   @Keep
   public static class Builder {
 
     private boolean isVerbose;
     private final DiagnosticsHandler diagnosticsHandler;
     private ProguardMapProducer proguardMapProducer;
-    private String regularExpression = StackTraceRegularExpressionParser.DEFAULT_REGULAR_EXPRESSION;
+    private String regularExpression = defaultRegularExpression();
 
     Builder(DiagnosticsHandler diagnosticsHandler) {
       this.diagnosticsHandler = diagnosticsHandler;