Support regular expressions in Editor search

[riverwanderer]

Trying to add a checkbox option for Regular Expression search.

[riverwanderer]

runtime error:

2023-09-17 22:20:42,499 [39877-AWT-EventQueue-0] INFO  VASSAL.build.GameModule - Commands & Colors: Napoleonics version 4.2.0a42
2023-09-17 22:20:43,501 [39877-main] ERROR VASSAL.tools.ErrorDialog - 
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "VASSAL.preferences.Prefs.getValue(String)" is null
	at VASSAL.launch.Launcher.<init>(Launcher.java:164)
	at VASSAL.launch.Editor.<init>(Editor.java:61)
	at VASSAL.launch.Editor.main(Editor.java:54)
Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "VASSAL.preferences.Prefs.getValue(String)" is null
	at VASSAL.tools.concurrent.SimpleFuture.get(SimpleFuture.java:92)
	at VASSAL.launch.Launcher.<init>(Launcher.java:108)
	... 2 common frames omitted
Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "VASSAL.preferences.Prefs.getValue(String)" is null
	at VASSAL.configure.ConfigureTree$SearchParameters.<init>(ConfigureTree.java:1887)
	at VASSAL.configure.ConfigureTree.<init>(ConfigureTree.java:278)
	at VASSAL.configure.ConfigureTree.<init>(ConfigureTree.java:217)
	at VASSAL.launch.ModuleEditorWindow.<init>(ModuleEditorWindow.java:41)
	at VASSAL.launch.EditModuleAction.loadModule(EditModuleAction.java:59)
	at VASSAL.launch.Editor.launch(Editor.java:82)
	at VASSAL.launch.Launcher$1.run(Launcher.java:96)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[riverwanderer]

Now working.

The example I've given in the documentation is somewhat redudant, as the regex "^ABC$" it turns out in the same as "ABC". Also the screenshots are now out of date. I can update them, but probably from a Mac rather than Windows.

[riverwanderer]

Regex expression is now pre-validated to avoid exception. Invalid regex is notified to the chat window.