By the way have you seen sregex ? Given its built with many of the
same principles as nginx and PREG(1/2) compatible maybe it might be of
interest?

And Merry Christmas for those who celebrate.

On Sat, 25 Dec 2021 at 09:11, Maxim Dounin <mdounin@mdounin.ru> wrote:
>
> details: https://hg.nginx.org/nginx/rev/fbbb5ce52995
> branches:
> changeset: 7982:fbbb5ce52995
> user: Maxim Dounin <mdounin@mdounin.ru>
> date: Sat Dec 25 01:07:16 2021 +0300
> description:
> PCRE2 and PCRE binary compatibility.
>
> With this change, dynamic modules using nginx regex interface can be used
> regardless of the variant of the PCRE library nginx was compiled with.
>
> If a module is compiled with different PCRE library variant, in case of
> ngx_regex_exec() errors it will report wrong function name in error
> messages. This is believed to be tolerable, given that fixing this will
> require interface changes.
>
> diffstat:
>
> src/core/ngx_regex.c | 46 ++++++++++++++++++++++++++++++++++++++++++----
> src/core/ngx_regex.h | 17 ++++++-----------
> 2 files changed, 48 insertions(+), 15 deletions(-)
>
> diffs (139 lines):
>
> diff -r 0b5f12d5c531 -r fbbb5ce52995 src/core/ngx_regex.c
> --- a/src/core/ngx_regex.c Sat Dec 25 01:07:15 2021 +0300
> +++ b/src/core/ngx_regex.c Sat Dec 25 01:07:16 2021 +0300
> @@ -118,6 +118,7 @@ ngx_regex_compile(ngx_regex_compile_t *r
> char *p;
> u_char errstr[128];
> size_t erroff;
> + uint32_t options;
> pcre2_code *re;
> ngx_regex_elt_t *elt;
> pcre2_general_context *gctx;
> @@ -152,11 +153,24 @@ ngx_regex_compile(ngx_regex_compile_t *r
> ngx_regex_malloc_done();
> }
>
> + options = 0;
> +
> + if (rc->options & NGX_REGEX_CASELESS) {
> + options |= PCRE2_CASELESS;
> + }
> +
> + if (rc->options & ~NGX_REGEX_CASELESS) {
> + rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
> + "regex \"%V\" compilation failed: invalid options",
> + &rc->pattern)
> + - rc->err.data;
> + return NGX_ERROR;
> + }
> +
> ngx_regex_malloc_init(rc->pool);
>
> - re = pcre2_compile(rc->pattern.data, rc->pattern.len,
> - (uint32_t) rc->options, &errcode, &erroff,
> - ngx_regex_compile_context);
> + re = pcre2_compile(rc->pattern.data, rc->pattern.len, options,
> + &errcode, &erroff, ngx_regex_compile_context);
>
> /* ensure that there is no current pool */
> ngx_regex_malloc_done();
> @@ -252,11 +266,26 @@ ngx_regex_compile(ngx_regex_compile_t *r
> char *p;
> pcre *re;
> const char *errstr;
> + ngx_uint_t options;
> ngx_regex_elt_t *elt;
>
> + options = 0;
> +
> + if (rc->options & NGX_REGEX_CASELESS) {
> + options |= PCRE_CASELESS;
> + }
> +
> + if (rc->options & ~NGX_REGEX_CASELESS) {
> + rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
> + "regex \"%V\" compilation failed: invalid options",
> + &rc->pattern)
> + - rc->err.data;
> + return NGX_ERROR;
> + }
> +
> ngx_regex_malloc_init(rc->pool);
>
> - re = pcre_compile((const char *) rc->pattern.data, (int) rc->options,
> + re = pcre_compile((const char *) rc->pattern.data, (int) options,
> &errstr, &erroff, NULL);
>
> /* ensure that there is no current pool */
> @@ -413,6 +442,15 @@ failed:
> return rc;
> }
>
> +#else
> +
> +ngx_int_t
> +ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures, ngx_uint_t size)
> +{
> + return pcre_exec(re->code, re->extra, (const char *) s->data, s->len,
> + 0, 0, captures, size);
> +}
> +
> #endif
>
>
> diff -r 0b5f12d5c531 -r fbbb5ce52995 src/core/ngx_regex.h
> --- a/src/core/ngx_regex.h Sat Dec 25 01:07:15 2021 +0300
> +++ b/src/core/ngx_regex.h Sat Dec 25 01:07:16 2021 +0300
> @@ -19,7 +19,6 @@
> #include <pcre2.h>
>
> #define NGX_REGEX_NO_MATCHED PCRE2_ERROR_NOMATCH /* -1 */
> -#define NGX_REGEX_CASELESS PCRE2_CASELESS
>
> typedef pcre2_code ngx_regex_t;
>
> @@ -28,7 +27,6 @@ typedef pcre2_code ngx_regex_t;
> #include <pcre.h>
>
> #define NGX_REGEX_NO_MATCHED PCRE_ERROR_NOMATCH /* -1 */
> -#define NGX_REGEX_CASELESS PCRE_CASELESS
>
> typedef struct {
> pcre *code;
> @@ -38,10 +36,13 @@ typedef struct {
> #endif
>
>
> +#define NGX_REGEX_CASELESS 0x00000001
> +
> +
> typedef struct {
> ngx_str_t pattern;
> ngx_pool_t *pool;
> - ngx_int_t options;
> + ngx_uint_t options;
>
> ngx_regex_t *regex;
> int captures;
> @@ -61,19 +62,13 @@ typedef struct {
> void ngx_regex_init(void);
> ngx_int_t ngx_regex_compile(ngx_regex_compile_t *rc);
>
> -#if (NGX_PCRE2)
> -
> ngx_int_t ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures,
> ngx_uint_t size);
> +
> +#if (NGX_PCRE2)
> #define ngx_regex_exec_n "pcre2_match()"
> -
> #else
> -
> -#define ngx_regex_exec(re, s, captures, size) \
> - pcre_exec(re->code, re->extra, (const char *) (s)->data, (s)->len, 0, 0, \
> - captures, size)
> #define ngx_regex_exec_n "pcre_exec()"
> -
> #endif
>
> ngx_int_t ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log);
> _______________________________________________
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> nginx-devel@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx-devel
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