Clarify digit pair matches

A reader requested an explanation via email.
shreyasminocha · May 12, 2020 · b574b67 · b574b67 · vercel · May 12, 2020
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commit b574b67
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diff --git a/chapters/character-escapes.mdx b/chapters/character-escapes.mdx
@@ -22,6 +22,11 @@ The character escape `\d` matches digit characters, from `0` to `9`. It is equiv
     <li>3.14159</li>
 </Example>
 
+<Note>
+    While <code>59</code> is also a pair of digits, most engines look for{" "}
+    <em>non-overlapping</em> matches from left to right by default.
+</Note>
+
 `\D` is the negation of `\d` and is equivalent to `[^0-9]`.
 
 <Example regex={/\D/g}>