clarify \X

Author: pryrt

content/docs/searching.md

@@ -401,7 +401,7 @@ In a regular expression (shortened into regex throughout), special characters in
 
 * `.` or `\C` ⇒ Matches any character. If you check the box which says **. matches newline**, the dot match any character, including newline sequences.  With the option unchecked, then `.` will only match characters within a line, and not the newline sequences (`\r` or `\n`).
 
-* `\X` ⇒ Matches a single non-combining character followed by any number of combining characters. This is useful if you have a Unicode encoded text with accents as separate, combining characters.  For example, the letter `ǭ̳̚`, with four combining characters after the `o`, can be found either with the regex `(?-i)o\x{0304}\x{0328}\x{031a}\x{0333}` or with the shorter regex `\X`.
+* `\X` ⇒ Matches a single non-combining character followed by any number (zero or more) combining characters. You can think of `\X` as a "`.` on steroids": it matches the whole [grapheme](https://en.wikipedia.org/wiki/Grapheme "character with all its modifiers") as a unit, not just the base character itself.  This is useful if you have a Unicode encoded text with accents as separate, combining characters.  For example, the letter `ǭ̳̚`, with four combining characters after the `o`, can be found either with the regex `(?-i)o\x{0304}\x{0328}\x{031a}\x{0333}` or with the shorter regex `\X` (the latter, being generic, matches more than just `ǭ̳̚`, inluding but not limited to `ą̳̄̚` or `o` alone); if you want to limit the `\X` in this example to just match a possibly-modified `o` (so "`o` followed by 0 or more modifiers"), use a lookahead before the `\X`: `(?=o)\X`, which would match `o` alone or `ǭ̳̚`, but not `ą̳̄̚`.  
 
 * `\$` , `\(` , `\)` , `\*` , `\+` , `\.` , `\?` , `\[` , `\]` , `\\` , `\|` ⇒ Prefixing a special character with `\` to "escape" the character allows you to search for a literal character when the regular expression syntax would otherwise have that character have a special meaning as a regex meta-character.
     * The characters `$ ( ) * + . ? [ ] \ |` all have special meaning to the regex engine in normal circumstances; to get them to match as a literal (or to show up as a literal in the substitution), you will have to prefix them with the `\` character.