regex: use regexec_buf()

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 9d0aea50cdeeb10de0f64770d26f2b390b146e2a..3cb301556eb2c6571298020cdea0374eb771638f 100644 (file)
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -267,8 +267,11 @@ expression to make sure that it matches all non-whitespace characters.
 A match that contains a newline is silently truncated(!) at the
 newline.
 +
+For example, `--word-diff-regex=.` will treat each character as a word
+and, correspondingly, show differences character by character.
++
 The regex can also be set via a diff driver or configuration option, see
-linkgit:gitattributes[1] or linkgit:git-config[1].  Giving it explicitly
+linkgit:gitattributes[5] or linkgit:git-config[1].  Giving it explicitly
 overrides any diff driver or configuration setting.  Diff drivers
 override configuration settings.
 
@@ -283,14 +286,24 @@ endif::git-format-patch[]
 
 ifndef::git-format-patch[]
 --check::
-       Warn if changes introduce whitespace errors.  What are
-       considered whitespace errors is controlled by `core.whitespace`
+       Warn if changes introduce conflict markers or whitespace errors.
+       What are considered whitespace errors is controlled by `core.whitespace`
        configuration.  By default, trailing whitespaces (including
        lines that solely consist of whitespaces) and a space character
        that is immediately followed by a tab character inside the
        initial indent of the line are considered whitespace errors.
        Exits with non-zero status if problems are found. Not compatible
        with --exit-code.
+
+--ws-error-highlight=<kind>::
+       Highlight whitespace errors on lines specified by <kind>
+       in the color specified by `color.diff.whitespace`.  <kind>
+       is a comma separated list of `old`, `new`, `context`.  When
+       this option is not given, only whitespace errors in `new`
+       lines are highlighted.  E.g. `--ws-error-highlight=new,old`
+       highlights whitespace errors on both deleted and added lines.
+       `all` can be used as a short-hand for `old,new,context`.
+
 endif::git-format-patch[]
 
 --full-index::