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.

More information in the help, [url:https://www.youtube.com/watch?v=55n7ZWaaRIg this video tutorial] and the following examples:
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
config:firstmsg
Matches the first message of a user in the current session
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.
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
user:botimuz
Match all regular messages by user 'Botimuz'
config:info [Notification]
Match all info messages containing '[Notification]', so basicially all subscriber notifications
config:firstmsg
Matches the first message of a user in the current session

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

Use the prefix to: for specifying one or several Custom Tabs to route to, for example to:Test start:!abc to add messages beginning with "!abc" to the Custom Tab named "Test" (case-insensitive).