diff --git a/strsync/strsync_playground.py b/strsync/strsync_playground.py
index edd3837..27eaf44 100644
--- a/strsync/strsync_playground.py
+++ b/strsync/strsync_playground.py
@@ -38,6 +38,7 @@
 %10c%5hc%5C%5lc
 The temp is %.*f
 %ss%lii
+${replacement}
 %*.*s | %.3d | %lC | %s%%%02d'''
 
 cfmt='''\
@@ -49,8 +50,10 @@
 (?:\.(?:\d+|\*))?                  # precision
 (?:h|l|ll|w|I|I32|I64)?            # size
 [cCdiouxXeEfgGaAnpsSZ@]            # type
-) |                                # OR
-%%)                                # literal "%%"
+)                                  # OR
+| \$\{.+\}                         # replacement for property "%{appName}"
+| %%                               # literal "%%"
+)
 '''
 
 for line in lines.splitlines():
diff --git a/strsync/strtrans.py b/strsync/strtrans.py
index eb340be..08b37e5 100644
--- a/strsync/strtrans.py
+++ b/strsync/strtrans.py
@@ -13,8 +13,10 @@
     (?:\.(?:\d+|\*))?                  # precision
     (?:h|l|ll|w|I|I32|I64)?            # size
     [cCdiouxXeEfgGaAnpsSZ@]            # type
-    ) |                                # OR
-    %%)                                # literal "%%"
+    )                                  # OR
+    | \$\{.+\}                         # replacement for property "%{appName}"
+    | %%                               # literal "%%"
+    )
 '''
 __LITERNAL_FORMAT_RE__ = re.compile(__LITERAL_REGEX__, flags=re.X)