made README worth a dime

README.md

@@ -1 +1,45 @@
 # Jëger
+A regex engine.
+
+### Syntax
+The aim was to follow Vim's regex syntax. Esoteric special characters such as "\zs" are not implemented, however the just is supported.
+| :----: | :---------------------: |
+| Symbol | Meaning (TODO: fill in) |
+| :----: | :---------------------: |
+| .      | |
+| =      | |
+| +      | |
+| *      | |
+| ?      | |
+| \\<    | |
+| \\>    | |
+| ^      | |
+| \t     | |
+| \n     | |
+| \b     | |
+| \i     | |
+| \I     | |
+| \k     | |
+| \K     | |
+| \f     | |
+| \F     | |
+| \p     | |
+| \P     | |
+| \s     | |
+| \d     | |
+| \D     | |
+| \x     | |
+| \X     | |
+| \o     | |
+| \O     | |
+| \w     | |
+| \W     | |
+| \h     | |
+| \a     | |
+| \l     | |
+| \L     | |
+| \u     | |
+| \U     | |
+| [\<range\>]   | |
+| [\^\<range\>] | |
+| :----: | :---------------------: |

source/jeger.c

@@ -352,6 +352,43 @@ int escape_to_negative(const char                    c,
 			cs->flags |= IS_NEGATIVE;
 			return sizeof(digit_chars)-1;
 		};
+		case 'X': {
+			const char hex_chars[] = JEGER_CHAR_SET_digits
+			                         JEGER_CHAR_SET_lower_hex
+			                         JEGER_CHAR_SET_upper_hex
+			                       ;
+			strcpy(cs->blacklist, hex_chars);
+			cs->flags |= IS_NEGATIVE;
+			return sizeof(hex_chars)-1;
+		};
+		case 'O': {
+			const char oct_chars[] = JEGER_CHAR_SET_octal_digits;
+			strcpy(cs->blacklist, oct_chars);
+			cs->flags |= IS_NEGATIVE;
+			return sizeof(oct_chars)-1;
+		};
+		case 'W': {
+			const char word_chars[] = JEGER_CHAR_SET_underscore
+			                          JEGER_CHAR_SET_digits
+			                          JEGER_CHAR_SET_lower
+			                          JEGER_CHAR_SET_upper
+			                        ;
+			strcpy(cs->blacklist, word_chars);
+			cs->flags |= IS_NEGATIVE;
+			return sizeof(word_chars)-1;
+		};
+		case 'L': {
+			const char lower_alpha_chars[] = JEGER_CHAR_SET_lower;
+			strcpy(cs->blacklist, lower_alpha_chars);
+			cs->flags |= IS_NEGATIVE;
+			return sizeof(lower_alpha_chars)-1;
+		};
+		case 'U': {
+			const char upper_alpha_chars[] = JEGER_CHAR_SET_upper;
+			strcpy(cs->blacklist, upper_alpha_chars);
+			cs->flags |= IS_NEGATIVE;
+			return sizeof(upper_alpha_chars)-1;
+		};
 	}
 
 	return 0;