public RegularExpression() 
{

}

default constructor

 public String getPattern(Project p) 
{
        init(p);
        if (isReference()) {
            return getRef(p).getPattern(p);
        }
        setPattern();
        return regexp.getPattern();
}

Gets the pattern string for this RegularExpression in the given project.

 public RegularExpression getRef(Project p) 
{
        return (RegularExpression) getCheckedRef(p);
}

Get the RegularExpression this reference refers to in the given project. Check for circular references too

 public Regexp getRegexp(Project p) 
{
        init(p);
        if (isReference()) {
            return getRef(p).getRegexp(p);
        }
        setPattern();
        return this.regexp;
}

provides a reference to the Regexp contained in this

 public  void setPattern(String pattern) 
{
        if (regexp == null) {
            myPattern = pattern;
            setPatternPending = true;
        } else {
            regexp.setPattern(pattern);
        }
}

sets the regular expression pattern