Detecting phone numbers using sapi?

Question

I am currently using sapi 5.4 and I want to detect a phone number which is sure of 10 digits from 0-9 what is the best way to specify in grammar file ?

Answer 1

Here's a simple sapi-format grammar ruleset that defines a rule that has 7-10 digits:

<rule name="phoneno">
  <phrase min="7" max="10">
    <ruleref name="digit" propname="digit"/>
  </phrase>
</rule>

<rule name="digit">
  <l>
    <p val="0">0</p>
    <p val="1">1</p>
    <p val="2">2</p>
    <p val="3">3</p>
    <p val="4">4</p>
    <p val="5">5</p>
    <p val="6">6</p>
    <p val="7">7</p>
    <p val="8">8</p>
    <p val="9">9</p>
  </l>
</rule>

This also sets up semantic properties so you can build the phone number by walking the semantic properties tree.