Regular Expressions not working in the Search Bar

Is it just me or are Regular Expressions not working in the Search Bar in 7.1.4? For example if I search for [a-z] using the Find And Replace dialog in the main editor window with the Regular Expressions option checked, it finds any alphabetic character, but the same expression (or any expression) in the search bar finds nothing.

I tried restarting with the "noplugins" option in case it was due to something I'd installed, but still nothing. Support info below:

PL/SQL Developer
Version 7.1.4.1390
01.46797 - 1 user license
Windows XP Professional 5.1 Build 2600 (Service Pack 2)

Physical memory : 2,096,532 kB (1,245,120 available)
Paging file : 3,513,004 kB (2,948,012 available)
Virtual memory : 2,097,024 kB (1,977,740 available)

Parameters
C:\Program Files\PLSQL Developer\plsqldev.exe
userid=x/y@z

Preferences
Session mode: Dual
OCI Library:
Use OCI7: False

Preference Files
C:\Program Files\PLSQL Developer\Preferences\Default\Default.ini
C:\Program Files\PLSQL Developer\Preferences\robertw\default.ini

Aliases

Homes
OracleClient10g_Client (C:\Apps\oracle\product\10.2.0\client)

DLLs
C:\Apps\oracle\product\10.2.0\client\bin\oci.dll

TNS File
C:\Apps\oracle\product\10.2.0\client\Network\Admin\tnsnames.ora

Using
Home: OracleClient10g_Client
DLL: C:\Apps\oracle\product\10.2.0\client\bin\oci.dll
OCI: version 9.2
Oracle Database 10g Enterprise Edition Release 10.1.0.3.0

Character Sets
Character size: 1 byte(s)
CharSetID: 46
NCharSetID: 2000
Unicode Support: True
NLS_LANG: AMERICAN_AMERICA.WE8MSWIN1252
NLS_CHARACTERSET: WE8ISO8859P15
NLS_NCHAR_CHARACTERSET: AL16UTF16
 
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