Precompile regex

jbgi · jbgi · commit e76812f402df · 2016-05-24T07:41:22.000+02:00
diff --git a/core/src/main/java/fj/function/Strings.java b/core/src/main/java/fj/function/Strings.java
@@ -3,6 +3,9 @@
 import fj.F;
 import fj.data.List;
 import fj.data.Stream;
+
+import java.util.regex.Pattern;
+
 import static fj.Function.curry;
 import static fj.function.Booleans.not;
 import static fj.function.Characters.isWhitespace;
@@ -17,6 +20,8 @@ private Strings() {
     throw new UnsupportedOperationException();
   }
 
+  private static final Pattern lineSeparatorPattern = Pattern.compile("\\r?\\n");
+
   public static final String lineSeparator = System.getProperty("line.separator");
 
     /**
@@ -76,7 +81,7 @@ private Strings() {
   public static final F<String, F<String, Boolean>> matches = curry((s1, s2) -> s2.matches(s1));
 
   public static List<String> lines(String s) {
-    return List.list(s.split("\\r?\\n"));
+    return List.list(lineSeparatorPattern.split(s));
   }
 
   public static F<String, List<String>> lines() {
