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regexpattern-matchingnant

Check that property matches pattern

Using NAnt, I'd like to check that my property matches the following pattern: [0-9a-zA-Z_].

I have tried this so far:

    <condition property="check-my-prop">
      <matches pattern="[1-9a-zA-Z_]" string="${MyProp}"/>
    </condition>
    <fail message="my-prop must match pattern [1-9a-zA-Z_]"
          unless="check-my-prop" />

NAnt throws an error: Invalid element <condition>. Unknown task or datatype.

Code is adapted from Ant, not NAnt.

How can I achieve the same goal?

Solution 
  •     <property name="CheckMyProp" value="" />
    <regex pattern="^(?'CheckMyProp'[1-9a-zA-Z_]+)$" input="${MyProp}" failonerror="false"/>    
    <if test="${string::get-length(CheckMyProp) == 0}">
      <fail>MyProp must match pattern [1-9a-zA-Z_]</fail>
    </if>