Can I use Bean class variable to <f:validateRegex pattern"#{bean.beanVariable}"> - jsf

Question

I am working with settings part in my project. I want to get the form attributes from the DB like maxlength, minlength, pattern etc.
I want to use my bean class variable as a pattern String. Is that Possible? minlength, maxlength attributes works fine using bean class variable, but validateRegex is not working
Bean code
#Service
class CategoryBean {
String categoryNamePattern;
String showForm(){
categoryNamePattern = "([a-zA-Z ]*[a-zA-Z]+[a-zA-Z ]*)";
return "myform.xhtml";
}
}
myform.xhtml With bean class variable for regex pattern
<p:inputText id="name" value="#{categoryBean.selectedCategory.name}">
<f:validateRegex for="name" pattern="#{categeoryBean.categoryNamePattern}"/>
</p:inputText>
myform.xhtml This Works fine with pattern defined inside
<p:inputText id="name" value="#{categoryBean.selectedCategory.name}">
<f:validateRegex for="name" pattern="([a-zA-Z ]*[a-zA-Z]+[a-zA-Z ]*)"/>
</p:inputText>

Answer 1

Finally I did with validator tag. wrote a new validator method
This works fine.
#Service
class CategoryBean {
String catNamePattern;
String showForm(){
categoryNamePattern = "([a-zA-Z ]*[a-zA-Z]+[a-zA-Z ]*)";
return "myform.xhtml";
}
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
if (catNamePattern != null) {
RegexValidator regexValidator = new RegexValidator();
regexValidator.setPattern(categoryNamePattern);
regexValidator.validate(context, component, value);
}
}
}
<p:inputText id="name" value="#{categoryBean.selectedCategory.name}">
<f:validateRegex for="name" pattern="#{categeoryBean.categoryNamePattern}" validator="#{categoryBean.validate}" />
</p:inputText>