Revert "Signal an error for the regexp "[:alnum:]""

This reverts commit 8d5e8cddab732ac90e9ae930c63f7830f9dab24f.

1 files changed, 1 insertions, 20 deletions

diff --git a/src/regex-emacs.c b/src/regex-emacs.c
index 38824370e05..694431c95e2 100644
--- a/src/regex-emacs.c
+++ b/src/regex-emacs.c
@@ -818,8 +818,7 @@ typedef enum
   REG_ESIZE,            /* Compiled pattern bigger than 2^16 bytes.  */
   REG_ERPAREN,          /* Unmatched ) or \); not returned from regcomp.  */
   REG_ERANGEX,          /* Range striding over charsets.  */
-  REG_ESIZEBR,          /* n or m too big in \{n,m\} */
-  REG_ECLASSBR,         /* Missing [] around [:class:].  */
+  REG_ESIZEBR           /* n or m too big in \{n,m\} */
 } reg_errcode_t;
 
 static const char *re_error_msgid[] =
@@ -843,7 +842,6 @@ static const char *re_error_msgid[] =
    [REG_ERPAREN] = "Unmatched ) or \\)",
    [REG_ERANGEX ] = "Range striding over charsets",
    [REG_ESIZEBR ] = "Invalid content of \\{\\}",
-   [REG_ECLASSBR] = "Class syntax is [[:digit:]]; missing brackets",
   };
 
 /* For 'regs_allocated'.  */
@@ -2002,23 +2000,6 @@ regex_compile (re_char *pattern, ptrdiff_t size,
 
             laststart = b;
 
-            /* Check for the mistake of forgetting the extra square brackets,
-               as in "[:alpha:]".  */
-            if (*p == ':')
-              {
-                re_char *q = p + 1;
-                while (q != pend && *q != ']')
-                  {
-                    if (*q == ':')
-                      {
-                        if (q + 1 != pend && q[1] == ']' && q > p + 1)
-                          FREE_STACK_RETURN (REG_ECLASSBR);
-                        break;
-                      }
-                    q++;
-                  }
-              }
-
             /* Test '*p == '^' twice, instead of using an if
                statement, so we need only one BUF_PUSH.  */
             BUF_PUSH (*p == '^' ? charset_not : charset);