regex101: Get any word before specific string

Regular Expression

^\w+(?=\s+OBJECT-TYPE)

New

STEELHEAD-MIB DEFINITIONS ::= BEGIN

IMPORTS
    OBJECT-TYPE, MODULE-IDENTITY, NOTIFICATION-TYPE, Unsigned32,
                 TimeTicks, IpAddress, Counter32, Counter64 FROM SNMPv2-SMI
    DateAndTime FROM SNMPv2-TC
    products FROM RBT-MIB;

steelhead MODULE-IDENTITY
          LAST-UPDATED        "201401070000Z"
          ORGANIZATION        "Riverbed Technology, Inc."
          CONTACT-INFO
          "  Riverbed Technical Support
             support@riverbed.com"
          DESCRIPTION         "Steelhead MIB"
          REVISION            "201401070000Z"
          DESCRIPTION         "Connection forwarding cluster incompatible trap"
          REVISION            "201301250000Z"
          DESCRIPTION         "Corrections in descriptions of some traps"
          REVISION            "201210170000Z"
          DESCRIPTION         "Added trap for CF Peer IPv6 incompatible alarm"
          REVISION            "201202030000Z"
          DESCRIPTION         "Updated for 7.0.1"
          ::= { products 1 }

system OBJECT IDENTIFIER
    ::= { steelhead 1 }

status OBJECT IDENTIFIER
    ::= { steelhead 2 }

config OBJECT IDENTIFIER
    ::= { steelhead 3 }

alarms OBJECT IDENTIFIER
    ::= { steelhead 4 }

statistics OBJECT IDENTIFIER
    ::= { steelhead 5 }

--
--
-- SYSTEM
--
--

model OBJECT-TYPE
    SYNTAX      OCTET STRING
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "Appliance model"
    ::= { system 1 }

serialNumber OBJECT-TYPE
    SYNTAX      OCTET STRING
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "Appliance serial number"
    ::= { system 2 }

systemVersion OBJECT-TYPE
    SYNTAX      OCTET STRING
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "System software version string"
    ::= { system 3 }



--
--
-- STATUS
--
--

systemClock OBJECT-TYPE
    SYNTAX      DateAndTime
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "System clock time"
    ::= { status 1 }

health OBJECT-TYPE
    SYNTAX      OCTET STRING
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "Current health of the system. The value is one amongst
             Healthy, Admission Control, Degraded, Critical"
    ::= { status 2 }

serviceStatus OBJECT-TYPE
    SYNTAX      OCTET STRING
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "Current status of the optimization service"
    ::= { status 3 }