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MINOR: sample: regsub now supports backreferences

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Now that the configuration parser is more flexible with samples,
converters and their arguments, we can leverage this to enable
support for backreferences in regsub.
This commit is contained in:
Jerome Magnin 2020-02-16 19:20:19 +01:00 committed by Willy Tarreau
parent 9af749b43e
commit 07e1e3c93e
2 changed files with 15 additions and 4 deletions
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5
doc/configuration.txt
View File

@ -14161,6 +14161,11 @@ regsub(<regex>,<subst>[,<flags>])
# copy query string to x-query and drop all leading '?', ';' and '&'
http-request set-header x-query "%[query,regsub([?;&]*,'')]"
# capture groups and backreferences
# both lines do the same.
http-request redirect location %[url,'regsub("(foo|bar)([0-9]+)?","\2\1",i)]'
http-request redirect location %[url,regsub(\"(foo|bar)([0-9]+)?\",\"\2\1\",i)]
capture-req(<id>)
Capture the string entry in the request slot <id> and returns the entry as
is. If the slot doesn't exist, the capture fails silently.

14
src/sample.c
View File

@ -2354,6 +2354,7 @@ static int sample_conv_regsub(const struct arg *arg_p, struct sample *smp, void
struct my_regex *reg = arg_p[0].data.reg;
regmatch_t pmatch[MAX_MATCH];
struct buffer *trash = get_trash_chunk();
struct buffer *output;
int flag, max;
int found;
@ -2386,16 +2387,21 @@ static int sample_conv_regsub(const struct arg *arg_p, struct sample *smp, void
if (!found)
break;
output = alloc_trash_chunk();
output->data = exp_replace(output->area, output->size, start, arg_p[1].data.str.area, pmatch);
/* replace the matching part */
max = trash->size - trash->data;
max = output->size - output->data;
if (max) {
if (max > arg_p[1].data.str.data)
max = arg_p[1].data.str.data;
if (max > output->data)
max = output->data;
memcpy(trash->area + trash->data,
arg_p[1].data.str.area, max);
output->area, max);
trash->data += max;
}
free_trash_chunk(output);
/* stop here if we're done with this string */
if (start >= end)
break;