QReplace
Find and replace values in vector layer attribute fields, spreadsheet-style (Excel/OpenOffice). Triggered with Ctrl+F from the attribute table, or from the Vector menu/toolbar by picking a layer and field.
Plugin for finding and replacing text in vector layer attribute fields. If launched with Ctrl+F while a layer's attribute table is open and active, it automatically preselects that layer (and, if possible, the current field/column). If launched from the Vector menu or the toolbar, it asks you to pick a layer and field. Supports match case, whole word, regular expressions, "all features" or "selected only" scope, Find Next, Replace and Replace All. Not to be confused with the existing "Field find/replace" plugin (right-click in the attribute table, based on the field calculator's regex_replace): QReplace works from the toolbar/Vector menu/Ctrl+F, with a step-by-step Find Next preview as well as Replace All.