To return the bit enclosed by parentheses in a string like
$string="HELLO USER SETH (NETBLK-SETH-00101) "
ereg("((NETBLK-.+))",$string,$match);
$match[1] would then (in the case of the supplied example) contain "NETBLK_SETH-00101"
Assumes
1: you insist the substring starts with "NETBLK-". Leave that bit off if you don't
2: There's only one parenthesised section per string.