ES regex match failure

Hey guys,
I wanna match some data about form-data in ES like

------WebKitFormBoundary9fB75AOSG0bMs1I4\x0D\x0AContent-Disposition: form-data; name=\x22upload\x22; filename=\x22shell.php\x22\x0D\x0AContent-Type: application/octet-stream\x0D\x0A\x0D\x0A<?php\x0D\x0Aerror_reporting(7);\x0D\x0A@set_magic_quotes_runtime(0);

And the data type is keyword, so I'm using regexp like this

  "query": {
      "regexp": {
         "data": ".*\\<\\?php.*"

But nothing return
The ES version is 7.8.1, Is there something wrong about this pattern?

Nothing wrong with the pattern - likely the content wasn't indexed because it is a long string.
By default keyword fields drop strings greater than 256 chars in length. This ignore_above setting can be increased but there's a hard limit of 32k.

A potentially better way of searching long strings is the new wildcard field in 7.9.
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