Matches text anywhere in the message (case insensitive). For example Bets open would match 'Bets open' or 'BETS OPEN'.

[help-settings:Highlight_Matching Text Matching Prefixes] can be put in front of the match text (anything after the prefix will be interpreted as text):

[help-settings:Highlight_Meta_Matching Meta Prefixes] can be put in front of Text Matching Prefixes and eachother (separated by a space). They can restrict by user, channel, message type and more.
user:botimuz cs:Bets open
Matches the user Botimuz saying 'Bets open' (case sensitive)
config:info [Notification]
Matches info messages containing '[Notification]', so all sub notifications
Examples:
user:Nightbot replacement:H: reg:Hours Watched:\\s
Replace 'Hours Watched: ' with 'H:' (in messages by Nightbot).
reg:^Stream Schedule:.*
Filter messages starting with 'Stream Schedule', default replacement ('..').
replacement:Schedule reg:^Stream Schedule:.*
Same as previous, but replace with 'Schedule'.
Note: This only filters the parts of the message that are matched. To ignore a message entirely use the Ignore feature.
Note: This only works for regular chat messages. Example: chan:joshimuz start:!bet Examples:
user:botimuz
Match all regular messages by user 'Botimuz'
config:info [Notification]
Match all info messages containing '[Notification]', so basicially all subscriber notifications

Note: Unticking the 'Enabled'-checkbox means that the default color will be used.