Select › Color Range: click a color in the image to select it everywhere, then adjust Fuzziness and add or remove colors with the eyedroppers (or Shift and Option). Invert selects everything else, such as the subject in front of a green screen. A black-and-white preview in the panel shows what's selected.
Change the font of just the selected letters while editing text, as you already can their color. The font menu shows (Multiple) when a selection mixes fonts. Projects saved with this version need Compositor 1.3.4 or later to open.
Dither's ASCII style now draws readable characters, laid out like lines of text, with its own Text Size.
Thanks to Cengokill for contributing to this release.