regex - Check that property matches pattern -


using nant, i'd check property matches following pattern: [0-9a-za-z_].

i have tried 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 error: invalid element <condition>. unknown task or datatype.

code adapted ant, not nant.

how can achieve same goal?

    <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>

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