diff --git a/common/space_lua/runtime.ts b/common/space_lua/runtime.ts
index 61228a7a..b7214607 100644
--- a/common/space_lua/runtime.ts
+++ b/common/space_lua/runtime.ts
@@ -315,6 +315,11 @@ export class LuaTable implements ILuaSettable, ILuaGettable {
     return this.arrayPart.length;
   }
 
+  hasKeys(): boolean {
+    return !!(Object.keys(this.stringKeys).length > 0 ||
+      this.arrayPart.length > 0 || (this.otherKeys && this.otherKeys.size > 0));
+  }
+
   keys(): any[] {
     const keys: any[] = Object.keys(this.stringKeys);
     for (let i = 0; i < this.arrayPart.length; i++) {
@@ -695,7 +700,7 @@ export function luaTruthy(value: any): boolean {
     return false;
   }
   if (value instanceof LuaTable) {
-    return value.length > 0;
+    return value.hasKeys();
   }
   return true;
 }
@@ -773,6 +778,17 @@ export function jsToLuaValue(value: any): any {
     return value;
   } else if (value instanceof Uint8Array || value instanceof ArrayBuffer) {
     return value;
+  } else if (Array.isArray(value) && "index" in value && "input" in value) {
+    // This is a RegExpMatchArray
+    const regexMatch = value as RegExpMatchArray;
+    const regexMatchTable = new LuaTable();
+    for (let i = 0; i < regexMatch.length; i++) {
+      regexMatchTable.set(i + 1, regexMatch[i]);
+    }
+    regexMatchTable.set("index", regexMatch.index);
+    regexMatchTable.set("input", regexMatch.input);
+    regexMatchTable.set("groups", regexMatch.groups);
+    return regexMatchTable;
   } else if (Array.isArray(value)) {
     const table = new LuaTable();
     for (let i = 0; i < value.length; i++) {
diff --git a/common/space_lua/stdlib/string.ts b/common/space_lua/stdlib/string.ts
index cd5412e9..ef7e0195 100644
--- a/common/space_lua/stdlib/string.ts
+++ b/common/space_lua/stdlib/string.ts
@@ -1,4 +1,5 @@
 import {
+  jsToLuaValue,
   LuaBuiltinFunction,
   luaCall,
   LuaMultiRes,
@@ -213,4 +214,13 @@ export const stringApi = new LuaTable({
   trim_end: new LuaBuiltinFunction((_sf, s: string) => {
     return s.trimEnd();
   }),
+  match_regex: new LuaBuiltinFunction((_sf, s: string, pattern: string) => {
+    const regex = new RegExp(pattern);
+    const result = s.match(regex);
+    return jsToLuaValue(result);
+    // if (!result) {
+    //   return new LuaMultiRes([]);
+    // }
+    // return new LuaMultiRes(result.slice(1));
+  }),
 });
diff --git a/common/space_lua/stdlib/table.ts b/common/space_lua/stdlib/table.ts
index 29d3c994..cb275372 100644
--- a/common/space_lua/stdlib/table.ts
+++ b/common/space_lua/stdlib/table.ts
@@ -1,6 +1,7 @@
 import {
   type ILuaFunction,
   LuaBuiltinFunction,
+  type LuaEnv,
   luaEquals,
   LuaRuntimeError,
   LuaTable,
@@ -17,7 +18,10 @@ export const tableApi = new LuaTable({
    * @returns The concatenated string.
    */
   concat: new LuaBuiltinFunction(
-    (_sf, tbl: LuaTable, sep?: string, i?: number, j?: number) => {
+    (_sf, tbl: LuaTable | any[], sep?: string, i?: number, j?: number) => {
+      if (Array.isArray(tbl)) {
+        return tbl.join(sep);
+      }
       sep = sep ?? "";
       i = i ?? 1;
       j = j ?? tbl.length;
@@ -70,7 +74,8 @@ export const tableApi = new LuaTable({
    * @param tbl - The table to get the keys from.
    * @returns The keys of the table.
    */
-  keys: new LuaBuiltinFunction((_sf, tbl: LuaTable) => {
+  keys: new LuaBuiltinFunction((_sf, tbl: LuaTable | LuaEnv) => {
+    console.log("Keys", tbl);
     return tbl.keys();
   }),
   /**
diff --git a/common/syscalls/command.ts b/common/syscalls/command.ts
index 491dfeb8..6cd6e2d2 100644
--- a/common/syscalls/command.ts
+++ b/common/syscalls/command.ts
@@ -38,7 +38,7 @@ export function commandSyscalls(
           const sf = new LuaStackFrame(tl, null);
           try {
             return luaValueToJS(
-              await luaCall(def.run, args.map(jsToLuaValue), sf),
+              await luaCall(def.run, args.map(jsToLuaValue), {}, sf),
             );
           } catch (e: any) {
             await handleLuaError(e, commonSystem.system);
@@ -60,7 +60,7 @@ export function commandSyscalls(
           const sf = new LuaStackFrame(tl, null);
           try {
             return luaValueToJS(
-              await luaCall(def.run, args.map(jsToLuaValue), sf),
+              await luaCall(def.run, args.map(jsToLuaValue), {}, sf),
             );
           } catch (e: any) {
             await handleLuaError(e, commonSystem.system);
diff --git a/common/syscalls/event.ts b/common/syscalls/event.ts
index e474f202..baad7f91 100644
--- a/common/syscalls/event.ts
+++ b/common/syscalls/event.ts
@@ -35,9 +35,10 @@ export function eventListenerSyscalls(
           );
           const sf = new LuaStackFrame(tl, null);
           try {
-            return luaValueToJS(
-              await luaCall(def.run, args.map(jsToLuaValue), sf),
+            const val = luaValueToJS(
+              await luaCall(def.run, args.map(jsToLuaValue), {}, sf),
             );
+            return val;
           } catch (e: any) {
             await handleLuaError(e, commonSystem.system);
           }
diff --git a/lib/manifest.ts b/lib/manifest.ts
index c2210eda..1f818896 100644
--- a/lib/manifest.ts
+++ b/lib/manifest.ts
@@ -53,6 +53,8 @@ export type SlashCommandDef = {
   name: string;
   description?: string;
   boost?: number;
+  // Parent AST nodes in which this slash command is available
+  contexts?: string[];
 };
 export type SlashCommandHookT = {
   slashCommand?: SlashCommandDef;
diff --git a/plugs/core/Library/Std/Config.md b/plugs/core/Library/Std/Config.md
index e8af163b..96e11f7c 100644
--- a/plugs/core/Library/Std/Config.md
+++ b/plugs/core/Library/Std/Config.md
@@ -19,7 +19,7 @@ function config.set(key, value)
     error("Config key not defined: " .. key)
   end
   if schema != true then
-    result = jsonschema.validate_object(schema, value)
+    local result = jsonschema.validate_object(schema, value)
     if result != nil then
       error("Validation error (" .. key .. "): " .. result)
     end
diff --git a/web/client.ts b/web/client.ts
index 90cb455c..605a272b 100644
--- a/web/client.ts
+++ b/web/client.ts
@@ -2,7 +2,7 @@ import type {
   CompletionContext,
   CompletionResult,
 } from "@codemirror/autocomplete";
-import type { Compartment } from "@codemirror/state";
+import type { Compartment, EditorState } from "@codemirror/state";
 import { EditorView } from "@codemirror/view";
 import { syntaxTree } from "@codemirror/language";
 import { compile as gitIgnoreCompiler } from "gitignore-parser";
@@ -892,21 +892,13 @@ export class Client implements ConfigContainer {
     const linePrefix = line.text.slice(0, selection.from - line.from);
 
     // Build up list of parent nodes, some completions need this
-    const parentNodes: string[] = [];
     const sTree = syntaxTree(editorState);
-    const currentNode = sTree.resolveInner(selection.from);
-    if (currentNode) {
-      let node: SyntaxNode | null = currentNode;
-      do {
-        if (node.name === "FencedCode" || node.name === "FrontMatter") {
-          const body = editorState.sliceDoc(node.from + 3, node.to - 3);
-          parentNodes.push(`${node.name}:${body}`);
-        } else {
-          parentNodes.push(node.name);
-        }
-        node = node.parent;
-      } while (node);
-    }
+    const currentNode = sTree.resolveInner(editorState.selection.main.from);
+
+    const parentNodes: string[] = this.extractParentNodes(
+      editorState,
+      currentNode,
+    );
 
     // Dispatch the event
     const results = await this.dispatchAppEvent(eventName, {
@@ -949,6 +941,23 @@ export class Client implements ConfigContainer {
     return currentResult;
   }
 
+  public extractParentNodes(editorState: EditorState, currentNode: SyntaxNode) {
+    const parentNodes: string[] = [];
+    if (currentNode) {
+      let node: SyntaxNode | null = currentNode;
+      do {
+        if (node.name === "FencedCode" || node.name === "FrontMatter") {
+          const body = editorState.sliceDoc(node.from + 3, node.to - 3);
+          parentNodes.push(`${node.name}:${body}`);
+        } else {
+          parentNodes.push(node.name);
+        }
+        node = node.parent;
+      } while (node);
+    }
+    return parentNodes;
+  }
+
   editorComplete(
     context: CompletionContext,
   ): Promise<CompletionResult | null> {
diff --git a/web/hooks/slash_command.ts b/web/hooks/slash_command.ts
index f2554dbd..2ba648a9 100644
--- a/web/hooks/slash_command.ts
+++ b/web/hooks/slash_command.ts
@@ -108,7 +108,17 @@ export class SlashCommandHook implements Hook<SlashCommandHookT> {
       return null;
     }
 
+    // Check if the slash command is available in the current context
+    const parentNodes = this.editor.extractParentNodes(ctx.state, currentNode);
+    // console.log("Parent nodes", parentNodes);
     for (const def of this.slashCommands.values()) {
+      if (
+        def.slashCommand.contexts && !def.slashCommand.contexts.some(
+          (context) => parentNodes.some((node) => node.startsWith(context)),
+        )
+      ) {
+        continue;
+      }
       options.push({
         label: def.slashCommand.name,
         detail: def.slashCommand.description,