urxvt-searchable-scrollback - Man Page

Adds regex search functionality to the scrollback buffer, triggered by the searchable-scrollback:start action (bound to M-s by default). While in search mode, normal terminal input/output is suspended and a regex is displayed at the bottom of the screen.

Inputting characters appends them to the regex and continues incremental search. BackSpace removes a character from the regex, Up and Down search upwards/downwards in the scrollback buffer, End jumps to the bottom. Escape leaves search mode and returns to the point where search was started, while Enter or Return stay at the current position and additionally stores the first match in the current line into the primary selection if the Shift modifier is active.

The regex defaults to “(?i)”, resulting in a case-insensitive search. To get a case-sensitive search you can delete this prefix using BackSpace or simply use an uppercase character which removes the “(?i)” prefix.

See perlre for more info about perl regular expression syntax.