The ability to do this can be easily coded in mIRC via the use of /filter.
Example:
alias wildfind {
var %w = @wildfind , %i = 1 , %text = $1-
window -he %w
clear %w
while ($chan(%i)) {
aline %w -------------- Channel: $v1
filter -wwzb $v1 %w %text
aline %w
inc %i
}
window -aw3 %w
}
/wildfind *Some*Wildcard*Text*
Edit: This script will search your (current networks) channels, and any matches found will be printed into the "@wildfind" window.