[PHP] preg_replace_callback

[tJey]

Hi. I have problem with preg_replace_callback. It seems that my pattern 
is bad, but I can't find any error.

Pattern : \[\s*((\d|\w|_)+)\s*\]
this pattern is intended to find strings like "[field]",
"[ fi12_eld]"...
but every time I get warning message
"Warning: preg_replace_callback(): Delimiter must not be alphanumeric or 
backslash in test.php on line 100"

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