add some handy builtin character classes as split separators (#84)

tablizer.pod

@@ -13,7 +13,7 @@ tablizer - Manipulate tabular output of other programs
       -n, --numbering                    Enable header numbering
       -N, --no-color                     Disable pattern highlighting
       -H, --no-headers                   Disable headers display
-      -s, --separator <string>           Custom field separator
+      -s, --separator <string>           Custom field separator (maybe char, string or :class:)
       -k, --sort-by <int|name>           Sort by column (default: 1)
       -z, --fuzzy                        Use fuzzy search [experimental]
       -F, --filter <field[!]=reg>        Filter given field with regex, can be used multiple times
@@ -153,6 +153,62 @@ Sorts timestamps.
 Finally the  B<-d> option  enables debugging  output which  is mostly
 useful for the developer.
 
+=head2 SEPARATOR
+
+The option B<-s> can be a single character, in which case the CSV
+parser will be invoked. You can also specify a string as
+separator. The string will be interpreted as literal string unless it
+is a valid go regular expression. For example:
+
+    -s '\t{2,}\'
+
+is being used as a regexp and will match two or more consecutive tabs.
+
+    -s 'foo'
+
+on the other hand is no regular expression and will be used literally.
+
+To make live easier, there are a couple of predefined regular
+expressions, which you can specify as classes:
+
+=over
+
+* 		:tab:      
+
+Matches a tab and eats spaces around it.
+
+*		:spaces:
+
+Matches 2 or more spaces.
+
+*		:pipe:
+
+Matches a pipe character and eats spaces around it.
+
+*		:default:
+
+Matches 2 or more spaces or tab. This is the default separator if none
+is specified.
+
+*		:nonword:
+
+Matches a non-word character.
+
+*		:nondigit:
+
+Matches a non-digit character.
+
+*		:special:
+
+Matches one or more special chars like brackets, dollar sign, slashes etc.
+
+*		:nonprint:
+
+Matches one or more non-printable characters.
+
+
+=back
+
 =head2 PATTERNS AND FILTERING
 
 You can reduce  the rows being displayed by using  one or more regular