add output colorization support using regexes

tablizer.pod

@@ -19,6 +19,7 @@ tablizer - Manipulate tabular output of other programs
       -F, --filter <field[!]=reg>        Filter given field with regex, can be used multiple times
       -T, --transpose-columns string     Transpose the speficied columns (separated by ,)
       -R, --regex-transposer </from/to/> Apply /search/replace/ regexp to fields given in -T
+      -K  --regex-colorizer /from/color/ colorize pattern of output (color: fg[:bg])
       -j, --json                         Read JSON input (must be array of hashes)
       -I, --interactive                  Interactively filter and select rows
       -g, --auto-headers                 Generate headers if there are none present in input
@@ -514,9 +515,20 @@ black, blue,  cyan, darkGray, default, green,  lightBlue, lightCyan,
 lightGreen,   lightMagenta,   lightRed,   lightWhite,   lightYellow,
 magenta, red, white, yellow
 
-The Variables B<FG> and B<BG> are being used to highlight matches. The
-other *FG and *BG variables are for colored table output (enabled with
-the C<-L> parameter).
+but you may also use HTML color codes without the hash sign.
+
+The Variables  B<FG> and  B<BG> are being  used to  highlight matching
+rows. The  other *FG and  *BG variables  are for colored  table output
+(enabled with the C<-L> parameter).
+
+You can also use the option C<-K> to colorize particular patterns, not
+whole lines. The option can be given multiple times and expects the
+following parameter:
+
+    -K '/regex/foreground[:background]/
+
+that is, background color is optional. This colorization will applied
+on top of any previous colorizations, if any.
 
 Colorization can be turned off completely either by setting the
 parameter C<-N> or the environment variable B<NO_COLOR> to a true value.