Check for a value in a message

Hi everyone,

Is there a way to just check in the message for a specific value? For example, If I have a message like this,

<item>

<subitem>abc</subitem>

</item>

<item>

<Subitem>bcd</subitem>

Can I check if throught the message abc occurs?? do I have to split the message into single messages and in a loop check for the value of subitem to be abc?? or is there any easy thing available to check for abc in the whole message..ofcourse I am talking about BPM here...