diff --git a/icu4c/source/tools/genrb/prscmnts.cpp b/icu4c/source/tools/genrb/prscmnts.cpp
index 1f34417f99f..75a8b0ee078 100644
--- a/icu4c/source/tools/genrb/prscmnts.cpp
+++ b/icu4c/source/tools/genrb/prscmnts.cpp
@@ -21,6 +21,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#if UCONFIG_NO_REGULAR_EXPRESSIONS==0 /* donot compile when RegularExpressions not available */
+
 #define MAX_SPLIT_STRINGS 20
 
 const char *patternStrings[UPC_LIMIT]={
@@ -227,3 +229,5 @@ getNote(const UChar* source, int32_t srcLen,
 
 }
 
+#endif /* UCONFIG_NO_REGULAR_EXPRESSIONS */
+
diff --git a/icu4c/source/tools/genrb/prscmnts.h b/icu4c/source/tools/genrb/prscmnts.h
index 1a5a263b4ab..5651b8089c7 100644
--- a/icu4c/source/tools/genrb/prscmnts.h
+++ b/icu4c/source/tools/genrb/prscmnts.h
@@ -19,6 +19,8 @@
 #ifndef PRSCMNTS_H
 #define PRSCMNTS_H 1
 
+#if UCONFIG_NO_REGULAR_EXPRESSIONS==0 /* donot compile when no RegularExpressions are available */
+
 enum UParseCommentsOption {
     UPC_TRANSLATE,
     UPC_NOTE,
@@ -53,5 +55,8 @@ getAt(const UChar* source, int32_t srcLen,
 U_CFUNC int32_t
 getCount(const UChar* source, int32_t srcLen, 
          UParseCommentsOption option, UErrorCode *status);
+
+#endif /* UCONFIG_NO_REGULAR_EXPRESSIONS */
+
 #endif
 
diff --git a/icu4c/source/tools/genrb/wrtxml.c b/icu4c/source/tools/genrb/wrtxml.c
index 912275f3293..1771167d0c6 100644
--- a/icu4c/source/tools/genrb/wrtxml.c
+++ b/icu4c/source/tools/genrb/wrtxml.c
@@ -493,6 +493,8 @@ print(UChar* src, int32_t srcLen,const char *tagStart,const char *tagEnd,  UErro
 static void
 printNoteElements(struct UString *src, UErrorCode *status){
 
+#if UCONFIG_NO_REGULAR_EXPRESSIONS==0 /* donot compile when no RegularExpressions are available */
+
     int32_t capacity = 0;
     UChar* note = NULL;
     int32_t noteLen = 0;
@@ -520,10 +522,19 @@ printNoteElements(struct UString *src, UErrorCode *status){
         }
     }
     uprv_free(note);
+#else
+    
+    fprintf(stderr, "Warning: Could not output comments to XLIFF file. ICU has been built without RegularExpression support.\n");
+
+#endif /* UCONFIG_NO_REGULAR_EXPRESSIONS */
+
 }
 
 static void
 printComments(struct UString *src, const char *resName, UBool printTranslate, UErrorCode *status){
+
+#if UCONFIG_NO_REGULAR_EXPRESSIONS==0 /* donot compile when no RegularExpressions are available */
+
     int32_t capacity = src->fLength;
     char* buf = NULL;
     int32_t bufLen = 0;
@@ -570,6 +581,11 @@ printComments(struct UString *src, const char *resName, UBool printTranslate, UE
         write_tabs(out);
         print(desc, descLen, "<!--", "-->", status);
     }
+#else
+
+    fprintf(stderr, "Warning: Could not output comments to XLIFF file. ICU has been built without RegularExpression support.\n");
+
+#endif /* UCONFIG_NO_REGULAR_EXPRESSIONS */
 
 }
 /* Writing Functions */
@@ -1294,7 +1310,7 @@ bundle_write_xml(struct SRBRoot *bundle, const char *outputDir,const char* outpu
     uprv_strncpy(originalFileName, filename + first, index);
 
     if(uprv_strcmp(originalFileName, srBundle->fLocale) != 0) {
-        fprintf(stdout, "warning! The file name is not same as the resource name!\n");
+        fprintf(stdout, "Warning: The file name is not same as the resource name!\n");
     }
 
     temp = originalFileName;