Update VersionFetcher regex for upstream versioning changes

Spigot dropped the -R0.1 from their version.
`1.14.2-R0.1-SNAPSHOT` -> `1.14.3-SNAPSHOT`

If this is changed upstream this commit can be reverted.

Spigot-Server-Patches/0018-Implement-Paper-VersionChecker.patch

@@ -1,4 +1,4 @@
-From 6383ef269e602f8ecc8b9043942b1f967dd2ce6a Mon Sep 17 00:00:00 2001
+From ff5e58ca90c1829949af2e08fe7ace095a0ed37a Mon Sep 17 00:00:00 2001
 From: Zach Brown <zach@zachbr.io>
 Date: Mon, 27 May 2019 03:40:05 -0500
 Subject: [PATCH] Implement Paper VersionChecker
@@ -6,7 +6,7 @@ Subject: [PATCH] Implement Paper VersionChecker
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperVersionFetcher.java b/src/main/java/com/destroystokyo/paper/PaperVersionFetcher.java
 new file mode 100644
-index 0000000000..ded51d042b
+index 000000000..1279072ff
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/PaperVersionFetcher.java
 @@ -0,0 +1,115 @@
@@ -24,7 +24,7 @@ index 0000000000..ded51d042b
 +import java.net.URL;
 +
 +public class PaperVersionFetcher implements VersionFetcher {
-+    private static final java.util.regex.Pattern VER_PATTERN = java.util.regex.Pattern.compile("^([0-9\\.]*)\\-.*R"); // R is an anchor, will always give '-R' at end
++    private static final java.util.regex.Pattern VER_PATTERN = java.util.regex.Pattern.compile("^([0-9.]*)-(pre[0-9].*-S|S)"); // S is an anchor, will always give '-S' at end
 +    private static final String GITHUB_BRANCH_NAME = "ver/1.14";
 +    private static @Nullable String mcVer;
 +
@@ -45,7 +45,7 @@ index 0000000000..ded51d042b
 +            java.util.regex.Matcher matcher = VER_PATTERN.matcher(org.bukkit.Bukkit.getBukkitVersion());
 +            if (matcher.find()) {
 +                String result = matcher.group();
-+                mcVer = result.substring(0, result.length() - 2); // strip 'R' anchor and trailing '-'
++                mcVer = result.substring(0, result.length() - 2); // strip 'S' anchor and trailing '-'
 +            } else {
 +                org.bukkit.Bukkit.getLogger().warning("Unable to match version to pattern! Report to PaperMC!");
 +                org.bukkit.Bukkit.getLogger().warning("Pattern: " + VER_PATTERN.toString());
@@ -126,7 +126,7 @@ index 0000000000..ded51d042b
 +    }
 +}
 diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
-index f7fdd0727b..ee5616cdfc 100644
+index fa32d4bb7..f9059b257 100644
 --- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
 +++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
 @@ -276,6 +276,11 @@ public final class CraftMagicNumbers implements UnsafeValues {
@@ -142,5 +142,5 @@ index f7fdd0727b..ee5616cdfc 100644
  
      /**
 -- 
-2.21.0
+2.22.0