From 71bf70e4d3e2eedac97b5a0af4ca597fc592c87c Mon Sep 17 00:00:00 2001
From: Eric Rykwalder <e.rykwalder@gmail.com>
Date: Wed, 9 Mar 2022 17:40:50 -0500
Subject: [PATCH] simplify inline tex parsing

---
 __tests__/extensions.ts |  2 ++
 src/extensions.ts       | 10 ++++------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/__tests__/extensions.ts b/__tests__/extensions.ts
index 210d958..cf24a28 100644
--- a/__tests__/extensions.ts
+++ b/__tests__/extensions.ts
@@ -263,6 +263,8 @@ Line 5}
     `
 {P:plaintext {XI:{xm:$}tex content{xm:$}} more plaintext}
 
+{P:plaintext {XI:{xm:$}tex content{xm:$}}more plaintext}
+
 {P:{XI:{xm:$}1.234{xm:$}}}
     `
   );
diff --git a/src/extensions.ts b/src/extensions.ts
index fe34053..37d78a5 100644
--- a/src/extensions.ts
+++ b/src/extensions.ts
@@ -429,16 +429,14 @@ export const Tex: MarkdownConfig = {
     {
       name: "TexInline",
       parse(cx: InlineContext, next: number, pos: number) {
-        let match = /^\$[^$\s]/.exec(cx.text.slice(pos - cx.offset));
+        let match = /^\$(?:[^$\t ][^$]*)?[^$\t \\]\$(\D|$)/.exec(
+          cx.text.slice(pos - cx.offset)
+        );
         if (!match) {
           return -1;
         }
         const start = pos;
-        match = /[^\t \\]\$(\D|$)/.exec(cx.text.slice(pos - cx.offset + 1));
-        if (!match) {
-          return -1;
-        }
-        const end = start + 1 + match.index + 2;
+        const end = start + match[0].length - match[1].length;
         return cx.addElement(
           cx.elt("TexInline", start, end, [
             cx.elt("TexMarker", start, start + 1),