FULL PRODUCT VERSION :
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
W2K, SP4

A DESCRIPTION OF THE PROBLEM :
xjc fails the following, otherwise legal, regular expression.
[ERROR] InvalidRegex: Pattern value '(?![0-9]{1,255}$)[_a-zA-Z0-9][\-._a-zA-Z0-9]{0,254}' is not a valid regular expression. The reported error was: 'This expression is not supported in the current option setting.'.
  line 10 of BasicTypes.xsd

The offending xml type is:
    <simpleType name="MyName">
        <restriction base="string">
            <pattern value="(?![0-9]{1,255}$)[_a-zA-Z0-9][\-._a-zA-Z0-9]{0,254}"/>
        </restriction>
    </simpleType>

This is not a critical problem, as one can change a regular expression to a more conventional one, but in some case it may be desirable


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a schema that contains the above type and run xjc on it


REPRODUCIBILITY :
This bug can be reproduced always.