How to extend the behavior of a common text field (such as text_general) to recognize regex

[Vinay B,]

This is easy if I only reqdefine a custom field to identify the desired
patterns (numbers, in my case)

For example, I could define a field thus:
    <!-- A text field that identifies numberical entities-->
    <fieldType name="text_num" class="solr.TextField" >
      <analyzer>
<tokenizer class="solr.PatternTokenizerFactory"
pattern="\s*[0-9][0-9-]*[0-9]?\s*" group="0"/>
      </analyzer>
    </fieldType>

Input:
hello, world bye 123-45 abcd 5555 sdfssdf --- aaa

Output:
123-45 , 5555

However, I also want to retain the behavio