For default settings without any configuration, yes you need an equals sign. You can always use any regex string to extract the key value pairs (example: $1::$2). You can also add any character to a list for key-value extraction. In transforms.conf, you'll just simply need to add a DELIMS block to your stanza:
Here's a block from the docs: Transforms.conf
DELIMS = <quoted string list>
* NOTE: This attribute is only valid for search-time field extractions.
* IMPORTANT: If a value may contain an embedded unescaped double quote character,
such as "foo"bar", use REGEX, not DELIMS. An escaped double quote (\") is ok.
* Optional. Used in place of REGEX when dealing with delimiter-based field extractions,
where field values (or field/value pairs) are separated by delimiters such as colons,
spaces, line breaks, and so on.
* Sets delimiter characters, first to separate data into field/value pairs, and then to
separate field from value.
* Each individual character in the delimiter string is used as a delimiter to split the event.
* Delimiters must be quoted with " " (use \ to escape).
* When the event contains full delimiter-separated field/value pairs, you enter two sets of
quoted characters for DELIMS:
* The first set of quoted delimiters extracts the field/value pairs.
* The second set of quoted delimiters separates the field name from its corresponding
value.
* When the event only contains delimiter-separated values (no field names) you use just one set
of quoted delimiters to separate the field values. Then you use the FIELDS attribute to
apply field names to the extracted values (see FIELDS, below).
* Alternately, Splunk reads even tokens as field names and odd tokens as field values.
* Splunk consumes consecutive delimiter characters unless you specify a list of field names.
* The following example of DELIMS usage applies to an event where field/value pairs are
seperated by '|' symbols and the field names are separated from their corresponding values
by '=' symbols:
[pipe_eq]
DELIMS = "|", "="
* Defaults to "".
check out this file in your splunk install for some samples:
[$SPLUNK_HOME]/etc/system/README/transforms.conf.example
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