diff --git a/_benchmarks/regex-without-lookahead-vs-regex-with-lookahead.md b/_benchmarks/regex-without-lookahead-vs-regex-with-lookahead.md
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+++ b/_benchmarks/regex-without-lookahead-vs-regex-with-lookahead.md
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+---
+title: Regex without lookahead vs Regex with lookahead
+setup: |
+  const attrs = [
+      'fa',
+      'has',
+      'is',
+      'fa-',
+      'has-',
+      'is-',
+      'fa-home',
+      'has-text-centered',
+      'is-primary',
+      'orientation',
+      'data-username',
+      'aria-hidden'
+    ]
+    
+    const checkAttribute = (attr, regex) => (new RegExp(regex)).test(attr)
+    const regexWithoutLookahead = '^(is|has|fa)-.+'
+    const regexWithLookahead = '^(?=(fa|has|is)-).+'
+tests:
+  -
+    name: Regex without lookahead
+    code: |
+      attrs.forEach(attr => {
+        const check = attr.trim().toLowerCase()
+        checkAttribute(check, regexWithoutLookahead)
+      })
+  -
+    name: Regex with lookahead
+    code: |
+      attrs.forEach(attr => {
+        const check = attr.trim().toLowerCase()
+        checkAttribute(check, regexWithLookahead)
+      })
+---
+