Is there a way for anyMatchingAttribute to work with references?

[#1]

As the question states I was wondering if it's possible to do something like:

anyMatchingAttribute(
${attributeToSearch}
).contains(${value})

Thank you

[#2]

@Jacccs 

An example or detailed description of yoru use case may be helpful in providing the bets guidance for you.  While the NiFi Expression Language (NEL) function anyMatchingAttribute expects a java regular expression that searches and returns values for multiple FlowFile attributes, that does not appear to be what you need???  Your attribute "attributeToSearch" implies only a single specific FlowFile attribute is desire to be checked if it contains some "${value}".  If this is correct, you would be able to use the following NEL:

${literal("${${attributeToSearch}}"):contains('${value}')}

For above NEL, let's assume a FlowFile with attribute "attributeToSearch" set to "username".  A FlowFile attribute "username" set to "admin-matt".  A FlowFile attribute "value" set to "admin".

The result of above NEL statement would be true
${$attributeToSearch}} would first resolve to ${username} which would then resolve to "admin-matt".  That "admin-matt" string would be then passed to the NEL contains function which will to check to see if that string contains the string "admin" within it.  The result is a boolean "true" or "false".

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Thank you,

Matt