Demo: regexize pattern str

slevithan · Oct 25, 2024 · 8e5c21c · 8e5c21c
1 parent 8a4d7a8
commit 8e5c21c
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/demo/demo.js b/demo/demo.js
@@ -30,7 +30,7 @@ function showOutput(el) {
       optimize: optionOptimizeValue,
       target: optionTargetValue,
     });
-    output = `/${re.pattern ? re.pattern : '(?:)'}/${re.flags}`;
+    output = `/${regexize(re.pattern)}/${re.flags}`;
   } catch (e) {
     outputEl.classList.add('error');
     output = `Error: ${e.message}`;
@@ -47,6 +47,10 @@ function escapeHtml(str) {
   return str.replace(/&/g, '&amp;').replace(/</g, '&lt;');
 }
 
+function regexize(str) {
+  return str === '' ? '(?:)' : str.replace(/\\?./gsu, m => m === '/' ? '\\/' : m);
+}
+
 function setFlagI(checked) {
   useFlagI = checked;
   showOutput(inputEl);