Hello,
Backreferences don't work with -w or -x in combination with -P:
$ echo aa | grep -Pw '(.)\1'
$
Or they work in an unexpected way:
$ echo aa | grep -Pw '(.)\2'
aa
The fix is simple:
--- src/pcresearch.c~ 2014-02-24 09:59:56.864374362 +0000
+++ src/pcresearch.c 2014-02-24 07:33:04.666398105 +0000
@@ -75,9 +75,9 @@ Pcompile (char const *pattern, size_t si
*n = '\0';
if (match_lines)
- strcpy (n, "^(");
+ strcpy (n, "^(?:");
if (match_words)
- strcpy (n, "\\b(");
+ strcpy (n, "\\b(?:");
n += strlen (n);
/* The PCRE interface doesn't allow NUL bytes in the pattern, so
