diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 401a6e154..89c1aac19 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -441,6 +441,23 @@
     return typeof value.toString != 'function' && typeof (value + '') == 'string';
   }
 
+  /**
+   * Checks the given string to determine if the character at the specified
+   * index is whitespace.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @param {number} index The character index.
+   * @returns {boolean} Returns `true` if specifed character is whitespace, else `false`.
+   */
+  function isWhitespaceAt(string, index) {
+    var c = string.charCodeAt(index);
+    return (
+      (c <= 160 && (c >= 9 && c <= 13) || c == 32 || c == 160) || c == 5760 || c == 6158 ||
+      (c >= 8192 && (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279))
+    );
+  }
+
   /**
    * Releases the given array back to the array pool.
    *
@@ -1915,8 +1932,8 @@
           return '';
         }
         string = String(string);
-        while (whitespace.indexOf(string.charAt(++start)) > -1) { }
-        while (whitespace.indexOf(string.charAt(--end)) > -1) { }
+        while (++start < end && isWhitespaceAt(string, start)) { }
+        while (end-- && isWhitespaceAt(string, end)) { }
         return string.slice(start, end + 1);
       };
     }
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index 8e19d2331..93f1479d1 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -3,60 +3,60 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
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diff --git a/dist/lodash.js b/dist/lodash.js
index 369715084..d558c6844 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -418,6 +418,23 @@
     };
   }
 
+  /**
+   * Checks the given string to determine if the character at the specified
+   * index is whitespace.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @param {number} index The character index.
+   * @returns {boolean} Returns `true` if specifed character is whitespace, else `false`.
+   */
+  function isWhitespaceAt(string, index) {
+    var c = string.charCodeAt(index);
+    return (
+      (c <= 160 && (c >= 9 && c <= 13) || c == 32 || c == 160) || c == 5760 || c == 6158 ||
+      (c >= 8192 && (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279))
+    );
+  }
+
   /**
    * Releases the given array back to the array pool.
    *
@@ -1614,8 +1631,8 @@
           return '';
         }
         string = String(string);
-        while (whitespace.indexOf(string.charAt(++start)) > -1) { }
-        while (whitespace.indexOf(string.charAt(--end)) > -1) { }
+        while (++start < end && isWhitespaceAt(string, start)) { }
+        while (end-- && isWhitespaceAt(string, end)) { }
         return string.slice(start, end + 1);
       };
     }
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index d250b91e7..fea0e8ad4 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -3,54 +3,54 @@
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+!ut||ut.global!==ut&&ut.window!==ut||(rt=ut);var ot=(ut=nt[typeof module]&&module&&!module.nodeType&&module)&&ut.exports===et&&et,it=g();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(rt._=it, define(function(){return it})):et&&ut?ot?(ut.exports=it)._=it:et._=it:rt._=it}).call(this);
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diff --git a/lodash.js b/lodash.js
index ea45e4593..4bb99ee7d 100644
--- a/lodash.js
+++ b/lodash.js
@@ -71,9 +71,6 @@
   /** Used to detect hexadecimal string values */
   var reHexPrefix = /^0[xX]/;
 
-  /** Used to match leading whitespace in strings */
-  var reLeadingWhitespace = RegExp('^[' + whitespace + ']+');
-
   /** Used to ensure capturing order of template delimiters */
   var reNoMatch = /($^)/;
 
@@ -443,6 +440,23 @@
     return typeof value.toString != 'function' && typeof (value + '') == 'string';
   }
 
+  /**
+   * Checks the given string to determine if the character at the specified
+   * index is whitespace.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @param {number} index The character index.
+   * @returns {boolean} Returns `true` if specifed character is whitespace, else `false`.
+   */
+  function isWhitespaceAt(string, index) {
+    var c = string.charCodeAt(index);
+    return (
+      (c <= 160 && (c >= 9 && c <= 13) || c == 32 || c == 160) || c == 5760 || c == 6158 ||
+      (c >= 8192 && (c <= 8202 || c == 8232 || c == 8233 || c == 8239 || c == 8287 || c == 12288 || c == 65279))
+    );
+  }
+
   /**
    * Releases the given array back to the array pool.
    *
@@ -1935,8 +1949,8 @@
           return '';
         }
         string = String(string);
-        while (whitespace.indexOf(string.charAt(++start)) > -1) { }
-        while (whitespace.indexOf(string.charAt(--end)) > -1) { }
+        while (++start < end && isWhitespaceAt(string, start)) { }
+        while (end-- && isWhitespaceAt(string, end)) { }
         return string.slice(start, end + 1);
       };
     }