Added overloaded ltrimmed and rtrimmed methods

ExSwift/String.swift

@@ -137,7 +137,16 @@ public extension String {
         :returns: Stripped string
     */
     func ltrimmed () -> String {
-        if let range = rangeOfCharacterFromSet(NSCharacterSet.whitespaceAndNewlineCharacterSet().invertedSet) {
+        return ltrimmed(NSCharacterSet.whitespaceAndNewlineCharacterSet())
+    }
+
+    /**
+        Strips the specified characters from the beginning of self.
+
+        :returns: Stripped string
+    */
+    func ltrimmed (set: NSCharacterSet) -> String {
+        if let range = rangeOfCharacterFromSet(set.invertedSet) {
             return self[range.startIndex..<endIndex]
         }
 
@@ -150,7 +159,16 @@ public extension String {
         :returns: Stripped string
     */
     func rtrimmed () -> String {
-        if let range = rangeOfCharacterFromSet(NSCharacterSet.whitespaceAndNewlineCharacterSet().invertedSet, options: NSStringCompareOptions.BackwardsSearch) {
+        return rtrimmed(NSCharacterSet.whitespaceAndNewlineCharacterSet())
+    }
+
+    /**
+        Strips the specified characters from the end of self.
+
+        :returns: Stripped string
+    */
+    func rtrimmed (set: NSCharacterSet) -> String {
+        if let range = rangeOfCharacterFromSet(set.invertedSet, options: NSStringCompareOptions.BackwardsSearch) {
             return self[startIndex..<range.endIndex]
         }
 

ExSwiftTests/ExSwiftStringTests.swift

@@ -130,4 +130,14 @@ class ExSwiftStringTests: XCTestCase {
         XCTAssertEqual("AB ".rtrimmed(), "AB")
         XCTAssertEqual("\n ABC   ".rtrimmed(), "\n ABC")
     }
+
+    func testLTrimmedForSet () {
+        XCTAssertEqual("ab   ".ltrimmed(NSCharacterSet.alphanumericCharacterSet()), "   ")
+        XCTAssertEqual("  ab".ltrimmed(NSCharacterSet.alphanumericCharacterSet()), "  ab")
+    }
+
+    func testRTrimmedForSet () {
+        XCTAssertEqual("ab   ".rtrimmed(NSCharacterSet.alphanumericCharacterSet()), "ab   ")
+        XCTAssertEqual("  ab".rtrimmed(NSCharacterSet.alphanumericCharacterSet()), "  ")
+    }
 }

README.md

@@ -196,7 +196,9 @@ Name | Signature
 **`matches`**|`matches (pattern: String, ignoreCase: Bool = false) -> [NSTextCheckingResult]?`
 **`insert`**|`insert (index: Int, _ string: String) -> String`
 **`ltrimmed`**|`ltrimmed () -> String`
+**`ltrimmed`**|`ltrimmed (set: NSCharacterSet) -> String`
 **`rtrimmed`**|`rtrimmed () -> String`
+**`rtrimmed`**|`rtrimmed (set: NSCharacterSet) -> String`
 **`trimmed`**|`trimmed () -> String`
 
 #### Class Methods ####