diff --git a/invokeai/frontend/web/package.json b/invokeai/frontend/web/package.json
index 6c9db74bbc..33d83f043a 100644
--- a/invokeai/frontend/web/package.json
+++ b/invokeai/frontend/web/package.json
@@ -85,6 +85,7 @@
     "konva": "^9.2.0",
     "lodash-es": "^4.17.21",
     "nanostores": "^0.9.2",
+    "ohm-js": "^17.1.0",
     "openapi-fetch": "^0.6.1",
     "overlayscrollbars": "^2.2.0",
     "overlayscrollbars-react": "^0.5.0",
diff --git a/invokeai/frontend/web/src/common/util/dynamicPrompts/grammar.ts b/invokeai/frontend/web/src/common/util/dynamicPrompts/grammar.ts
new file mode 100644
index 0000000000..ccd865f2ff
--- /dev/null
+++ b/invokeai/frontend/web/src/common/util/dynamicPrompts/grammar.ts
@@ -0,0 +1,152 @@
+import * as ohm from 'ohm-js';
+
+const grammarSource = `
+Prompt {
+  exp
+    = exp choicesStart multi_number multi_trigger choices choicesEnd exp --multi_choices
+    | exp choicesStart multi_number multi_trigger multi_joinString multi_trigger choices choicesEnd exp --multi_choicesWithJoinString
+    | exp choicesStart choices choicesEnd exp --choices
+    | text --text
+
+  choices
+    = listOf<choice, choicesDelimiter>
+
+  text
+  	= (~choicesStart any)* 
+
+  choice
+    = (~reservedChar any)*
+
+  reservedChar
+    = (choicesEnd | choicesStart | choicesDelimiter | multi_trigger)
+
+  choicesStart
+    = "{"
+
+  choicesEnd
+    = "}"
+
+  choicesDelimiter
+    = "|"
+    
+  multi_trigger
+    = "$$"
+    
+  multi_number
+    = digit+
+    
+  multi_joinString
+    = (~multi_trigger choice)
+  
+}`;
+
+const getPermutationsOfSize = (array: string[], size: number): string[][] => {
+  const result: string[][] = [];
+
+  function permute(arr: string[], m: string[] = []) {
+    if (m.length === size) {
+      result.push(m);
+      return;
+    }
+    for (let i = 0; i < arr.length; i++) {
+      const curr = arr.slice();
+      const next = curr.splice(i, 1);
+      permute(curr, m.concat(next));
+    }
+  }
+
+  permute(array);
+
+  return result;
+};
+
+export const dynamicPromptsGrammar = ohm.grammar(grammarSource);
+
+export const dynamicPromptsSemantics = dynamicPromptsGrammar
+  .createSemantics()
+  .addOperation('expand', {
+    exp_multi_choices: function (
+      before,
+      _choicesStart,
+      number,
+      _multiTrigger,
+      choices,
+      _choicesEnd,
+      after
+    ) {
+      const beforePermutations = before.expand();
+      const choicePermutations = getPermutationsOfSize(
+        choices.expand(),
+        Number(number.sourceString)
+      );
+      const afterPermutations = after.expand();
+      const sep = ',';
+
+      const combined = [];
+      for (const b of beforePermutations) {
+        for (const c of choicePermutations) {
+          for (const a of afterPermutations) {
+            combined.push(b + c.join(sep) + a);
+          }
+        }
+      }
+      return combined;
+    },
+    exp_multi_choicesWithJoinString: function (
+      before,
+      _choicesStart,
+      number,
+      _multiTrigger1,
+      _multiJoinString,
+      _multiTrigger2,
+      choices,
+      _choicesEnd,
+      after
+    ) {
+      const beforePermutations = before.expand();
+      const choicePermutations = getPermutationsOfSize(
+        choices.expand(),
+        Number(number.sourceString)
+      );
+      const afterPermutations = after.expand();
+      const sep = _multiJoinString.sourceString;
+
+      const combined = [];
+      for (const b of beforePermutations) {
+        for (const c of choicePermutations) {
+          for (const a of afterPermutations) {
+            combined.push(b + c.join(sep) + a);
+          }
+        }
+      }
+      return combined;
+    },
+    exp_choices: function (before, _choicesStart, choices, _choicesEnd, after) {
+      const beforePermutations = before.expand();
+      const choicePermutations = choices.expand();
+      const afterPermutations = after.expand();
+
+      const combined: string[] = [];
+      for (const b of beforePermutations) {
+        for (const c of choicePermutations) {
+          for (const a of afterPermutations) {
+            combined.push(b + c + a);
+          }
+        }
+      }
+
+      return combined;
+    },
+    exp_text: function (text) {
+      return [text.sourceString];
+    },
+    choices: function (choices) {
+      return choices.asIteration().children.map((c) => c.sourceString);
+    },
+    _iter: function (...children) {
+      children.map((c) => c.expand());
+    },
+    _terminal: function () {
+      return this.sourceString;
+    },
+  });
diff --git a/invokeai/frontend/web/src/common/util/dynamicPrompts/useDynamicPrompts.ts b/invokeai/frontend/web/src/common/util/dynamicPrompts/useDynamicPrompts.ts
new file mode 100644
index 0000000000..8ad2bf7ad6
--- /dev/null
+++ b/invokeai/frontend/web/src/common/util/dynamicPrompts/useDynamicPrompts.ts
@@ -0,0 +1,17 @@
+import { useMemo } from 'react';
+import { useDebounce } from 'use-debounce';
+import { dynamicPromptsGrammar, dynamicPromptsSemantics } from './grammar';
+
+const parsePrompt = (prompt: string): { prompts: string[]; error: boolean } => {
+  const match = dynamicPromptsGrammar.match(prompt);
+  if (match.failed()) {
+    return { prompts: [prompt], error: true };
+  }
+  return { prompts: dynamicPromptsSemantics(match).expand(), error: false };
+};
+
+export const useDynamicPrompts = (prompt: string) => {
+  const [debouncedPrompt] = useDebounce(prompt, 500, { leading: false });
+  const result = useMemo(() => parsePrompt(debouncedPrompt), [debouncedPrompt]);
+  return result;
+};
diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamPositiveConditioning.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamPositiveConditioning.tsx
index 59b5138e3e..18caf469f9 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamPositiveConditioning.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamPositiveConditioning.tsx
@@ -1,4 +1,4 @@
-import { Box, FormControl, useDisclosure } from '@chakra-ui/react';
+import { Box, FormControl, Text, useDisclosure } from '@chakra-ui/react';
 import { stateSelector } from 'app/store/store';
 import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
 import { ChangeEvent, KeyboardEvent, useCallback, useRef } from 'react';
@@ -20,6 +20,7 @@ import { flushSync } from 'react-dom';
 import { useHotkeys } from 'react-hotkeys-hook';
 import { useTranslation } from 'react-i18next';
 import { useFeatureStatus } from '../../../../system/hooks/useFeatureStatus';
+import { useDynamicPrompts } from 'common/util/dynamicPrompts/useDynamicPrompts';
 
 const promptInputSelector = createSelector(
   [stateSelector, activeTabNameSelector],
@@ -48,6 +49,7 @@ const ParamPositiveConditioning = () => {
   const promptRef = useRef<HTMLTextAreaElement>(null);
   const { isOpen, onClose, onOpen } = useDisclosure();
   const { t } = useTranslation();
+  const parseResult = useDynamicPrompts(prompt);
   const handleChangePrompt = useCallback(
     (e: ChangeEvent<HTMLTextAreaElement>) => {
       dispatch(setPositivePrompt(e.target.value));
@@ -155,6 +157,13 @@ const ParamPositiveConditioning = () => {
           <AddEmbeddingButton onClick={onOpen} />
         </Box>
       )}
+      <Box>
+        generated {parseResult.prompts.length} prompts:
+        {parseResult.error && <Text color="error.500">Parsing failed</Text>}
+        {parseResult.prompts.map((p, i) => (
+          <Text key={`${p}.${i}`}>{p}</Text>
+        ))}
+      </Box>
     </Box>
   );
 };
diff --git a/invokeai/frontend/web/yarn.lock b/invokeai/frontend/web/yarn.lock
index 834e6368c4..f8b5bba26e 100644
--- a/invokeai/frontend/web/yarn.lock
+++ b/invokeai/frontend/web/yarn.lock
@@ -5074,6 +5074,11 @@ object.values@^1.1.6:
     define-properties "^1.1.4"
     es-abstract "^1.20.4"
 
+ohm-js@^17.1.0:
+  version "17.1.0"
+  resolved "https://registry.yarnpkg.com/ohm-js/-/ohm-js-17.1.0.tgz#50d8e08f69d7909931998d75202d35e2a90c8885"
+  integrity sha512-xc3B5dgAjTBQGHaH7B58M2Pmv6WvzrJ/3/7LeUzXNg0/sY3jQPdSd/S2SstppaleO77rifR1tyhdfFGNIwxf2Q==
+
 once@^1.3.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"