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    <p>JavaScript strings are UCS-2 encoded but can represent Unicode code points outside the Basic Multilingual Pane (<code>U+0000</code> - <code>U+D7FF</code> and <code>U+E000</code> - <code>U+FFFF</code>) using two 16 bit numbers (a UTF-16 <em>surrogate pair</em>), the first of which must be in the range <code>U+D800</code> - <code>U+DFFF</code>.</p> <p>Based on this, it's easy to detect whether a string contains any characters that lie outside the Basic Multilingual Plane (which is what I think you're asking: you want to be able to identify whether a string contains any characters that lie outside the range of code points that JavaScript represents as a single character):</p> <pre><code>function containsSurrogatePair(str) { return /[\uD800-\uDFFF]/.test(str); } alert( containsSurrogatePair("foo") ); // false alert( containsSurrogatePair("f") ); // true </code></pre> <p>Working out precisely which code points are contained in your string is a little harder and requires a UTF-16 decoder. The following will convert a string into an array of Unicode code points:</p> <pre><code>var getStringCodePoints = (function() { function surrogatePairToCodePoint(charCode1, charCode2) { return ((charCode1 &amp; 0x3FF) &lt;&lt; 10) + (charCode2 &amp; 0x3FF) + 0x10000; } // Read string in character by character and create an array of code points return function(str) { var codePoints = [], i = 0, charCode; while (i &lt; str.length) { charCode = str.charCodeAt(i); if ((charCode &amp; 0xF800) == 0xD800) { codePoints.push(surrogatePairToCodePoint(charCode, str.charCodeAt(++i))); } else { codePoints.push(charCode); } ++i; } return codePoints; } })(); alert( getStringCodePoints("f").join(",") ); // 102,119558 </code></pre>
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