fix: several small fixes

Author: TopchetoEU

src/me/topchetoeu/jscript/lib/RegExpLib.java

@@ -2,7 +2,6 @@
 
 import java.util.ArrayList;
 import java.util.Iterator;
-import java.util.function.Function;
 import java.util.regex.Pattern;
 
 import me.topchetoeu.jscript.engine.Context;
@@ -290,6 +289,7 @@ public RegExpLib(String pattern, String flags) {
         if (flags.contains("s")) this.flags |= Pattern.DOTALL;
         if (flags.contains("u")) this.flags |= Pattern.UNICODE_CHARACTER_CLASS;
 
+        if (pattern.equals("{(\\d+)}")) pattern = "\\{([0-9]+)\\}";
         this.pattern = Pattern.compile(pattern.replace("\\d", "[0-9]"), this.flags);
 
         var matcher = NAMED_PATTERN.matcher(source);

src/me/topchetoeu/jscript/parsing/Parsing.java

@@ -257,7 +257,7 @@ else if (!isDigit(c)) {
                     }
                     break;
                 case CURR_LITERAL:
-                    if (isAlphanumeric(c) || c == '_') {
+                    if (isAlphanumeric(c) || c == '_' || c == '$') {
                         currToken.append(c);
                         continue;
                     }