diff --git a/src/steps/rewrite-icons.js b/src/steps/rewrite-icons.js
index d0220451..97ad2d45 100644
--- a/src/steps/rewrite-icons.js
+++ b/src/steps/rewrite-icons.js
@@ -13,7 +13,7 @@
 import { h } from 'hastscript';
 import { CONTINUE, SKIP, visit } from 'unist-util-visit';
 
-const REGEXP_ICON = /(?<!(?:https?|urn)[^\s]*):(#?[a-z_-]+[a-z\d]*):/gi;
+const REGEXP_ICON = /(?<!(?:https?|urn)[^\s]*):((?!\d{2}:)[#a-z\d_-]+[a-z\d]*):/gi;
 
 /**
  * Create a <span> icon element:
diff --git a/test/fixtures/content/icons-ignored.html b/test/fixtures/content/icons-ignored.html
index 47f247b3..fa9cd5ef 100644
--- a/test/fixtures/content/icons-ignored.html
+++ b/test/fixtures/content/icons-ignored.html
@@ -5,5 +5,7 @@ <h1 id="icons">Icons</h1>
         <pre><code>:rocket:</code></pre>
         <p><a href="https://example.test/:urn:">https://example.test/:urn:</a></p>
         <p>urn:aaid:sc:VA6C2:ac6066f3-fd1d-4e00-bed3-fa3aa6d981d8</p>
+        <p>:this is also ignored:</p>
+        <p>08:28:54</p>
     </div>
-</main>
\ No newline at end of file
+</main>
diff --git a/test/fixtures/content/icons-ignored.md b/test/fixtures/content/icons-ignored.md
index 30301a79..07ef29c1 100644
--- a/test/fixtures/content/icons-ignored.md
+++ b/test/fixtures/content/icons-ignored.md
@@ -9,3 +9,7 @@
 [https://example.test/:urn:](https://example.test/:urn:)
 
 urn:aaid:sc:VA6C2:ac6066f3-fd1d-4e00-bed3-fa3aa6d981d8
+
+:this is also ignored:
+
+08:28:54
diff --git a/test/fixtures/content/icons.html b/test/fixtures/content/icons.html
index 9ff77789..f022c1ee 100644
--- a/test/fixtures/content/icons.html
+++ b/test/fixtures/content/icons.html
@@ -1,9 +1,22 @@
 <main>
     <div>
         <h1 id="icons">Icons</h1>
-        <p>Hello <span class="icon icon-button"></span></p>
-        <p>Hello <span class="icon icon-red"></span> banner.</p>
-        <p>Hello <span class="icon icon-check"></span> mark.</p>
+        <p>Hello<span class="icon icon-button"></span></p>
+        <p>Hello <span class="icon icon-red"></span>banner.</p>
+        <p>Hello <span class="icon icon-check"></span>mark.</p>
         <p>Team<span class="icon icon-rocket"></span>blasting off again.</p>
+        <p>This is a <span class="icon icon-a-10-check"></span>that should work</p>
+        <p>number check<span class="icon icon-1-check"></span></p>
+        <p>number check<span class="icon icon-two-2-check"></span></p>
+        <p>number check<span class="icon icon-three-3-check"></span></p>
+        <p>number check<span class="icon icon-four4check"></span></p>
+        <p>number check<span class="icon icon-5-check"></span></p>
+        <p>number check<span class="icon icon-six-6000-check"></span></p>
+        <p>number check<span class="icon icon-seven7000check"></span></p>
+        <p>number check<span class="icon icon-8000check"></span></p>
+        <p>number check<span class="icon icon-nine9000"></span></p>
+        <p>number check<span class="icon icon-ten-10000"></span></p>
+        <p>number check<span class="icon icon-eleven-11"></span></p>
+        <p>number check<span class="icon icon-twelve-v1"></span></p>
     </div>
-</main>
\ No newline at end of file
+</main>
diff --git a/test/fixtures/content/icons.md b/test/fixtures/content/icons.md
index b84468f4..93787d82 100644
--- a/test/fixtures/content/icons.md
+++ b/test/fixtures/content/icons.md
@@ -7,3 +7,29 @@ Hello :red: banner.
 Hello :#check: mark.
 
 Team:rocket:blasting off again.
+
+This is a :a-10-check: that should work
+
+number check :1-check:
+
+number check :two-2-check:
+
+number check :three-3-check:
+
+number check :four4check:
+
+number check :5-check:
+
+number check :six-6000-check:
+
+number check :seven7000check:
+
+number check :8000check:
+
+number check :nine9000:
+
+number check :ten-10000:
+
+number check :eleven-11:
+
+number check :twelve-v1: