Index: src/OFString.h
==================================================================
--- src/OFString.h
+++ src/OFString.h
@@ -594,10 +594,21 @@
  * \param string The string to prepend
  * \return A new autoreleased OFString with the specified string prepended
  */
 - (OFString*)stringByPrependingString: (OFString*)string;
 
+/**
+ * Creates a new string by replacing the occurrences of the specified string
+ * with the specified replacement.
+ *
+ * \param string The string to replace
+ * \param replacement The string with which it should be replaced
+ * \return A new string with the occurrences of the specified string replaced
+ */
+- (OFString*)stringByReplacingOccurrencesOfString: (OFString*)string
+				       withString: (OFString*)replacement;
+
 /**
  * \return The string in uppercase
  */
 - (OFString*)uppercaseString;
 

Index: src/OFString.m
==================================================================
--- src/OFString.m
+++ src/OFString.m
@@ -1430,10 +1430,23 @@
 {
 	OFMutableString *new = [[string mutableCopy] autorelease];
 
 	[new appendString: self];
 
+	[new makeImmutable];
+
+	return new;
+}
+
+- (OFString*)stringByReplacingOccurrencesOfString: (OFString*)string
+				       withString: (OFString*)replacement
+{
+	OFMutableString *new = [[self mutableCopy] autorelease];
+
+	[new replaceOccurrencesOfString: string
+			     withString: replacement];
+
 	[new makeImmutable];
 
 	return new;
 }