MEDIUM: regex: replace all standard regex function by own functions

This patch remove all references of standard regex in haproxy. The last
remaining references are only in the regex.[ch] files.

In the file src/checks.c, the original function uses a "pmatch" array.
In fact this array is unused. This patch remove it.
diff --git a/include/common/regex.h b/include/common/regex.h
index cec68c8..29a6ace 100644
--- a/include/common/regex.h
+++ b/include/common/regex.h
@@ -60,7 +60,7 @@
 
 struct hdr_exp {
     struct hdr_exp *next;
-    const regex_t *preg;		/* expression to look for */
+    struct my_regex *preg;		/* expression to look for */
     int action;				/* ACT_ALLOW, ACT_REPLACE, ACT_REMOVE, ACT_DENY */
     const char *replace;		/* expression to set instead */
     void *cond;				/* a possible condition or NULL */
@@ -81,7 +81,7 @@
 int regex_comp(const char *str, struct my_regex *regex, int cs, int cap, char **err);
 int exp_replace(char *dst, unsigned int dst_size, char *src, const char *str, const regmatch_t *matches);
 const char *check_replace_string(const char *str);
-const char *chain_regex(struct hdr_exp **head, const regex_t *preg,
+const char *chain_regex(struct hdr_exp **head, struct my_regex *preg,
 			int action, const char *replace, void *cond);
 
 /* If the function doesn't match, it returns false, else it returns true.
diff --git a/include/types/checks.h b/include/types/checks.h
index d5038eb..a50043b 100644
--- a/include/types/checks.h
+++ b/include/types/checks.h
@@ -177,7 +177,7 @@
 	/* sent string is string */
 	char *string;                           /* sent or expected string */
 	int string_len;                         /* string lenght */
-	regex_t *expect_regex;                  /* expected */
+	struct my_regex *expect_regex;          /* expected */
 	int inverse;                            /* 0 = regular match, 1 = inverse match */
 	unsigned short port;                    /* port to connect to */
 	unsigned short conn_opts;               /* options when setting up a new connection */
diff --git a/include/types/proto_http.h b/include/types/proto_http.h
index ff196a0..affc231 100644
--- a/include/types/proto_http.h
+++ b/include/types/proto_http.h
@@ -419,7 +419,7 @@
 			char *name;            /* header name */
 			int name_len;          /* header name's length */
 			struct list fmt;       /* log-format compatible expression */
-			regex_t* re;           /* used by replace-header and replace-value */
+			struct my_regex re;    /* used by replace-header and replace-value */
 		} hdr_add;                     /* args used by "add-header" and "set-header" */
 		struct redirect_rule *redir;   /* redirect rule or "http-request redirect" */
 		int nice;                      /* nice value for HTTP_REQ_ACT_SET_NICE */
@@ -445,7 +445,7 @@
 			char *name;            /* header name */
 			int name_len;          /* header name's length */
 			struct list fmt;       /* log-format compatible expression */
-			regex_t* re;           /* used by replace-header and replace-value */
+			struct my_regex re;    /* used by replace-header and replace-value */
 		} hdr_add;                     /* args used by "add-header" and "set-header" */
 		int nice;                      /* nice value for HTTP_RES_ACT_SET_NICE */
 		int loglevel;                  /* log-level value for HTTP_RES_ACT_SET_LOGL */
diff --git a/include/types/proxy.h b/include/types/proxy.h
index 33524f3..b33b634 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -343,7 +343,7 @@
 	char *check_req;			/* HTTP or SSL request to use for PR_O_HTTP_CHK|PR_O_SSL3_CHK */
 	int check_len;				/* Length of the HTTP or SSL3 request */
 	char *expect_str;			/* http-check expected content : string or text version of the regex */
-	regex_t *expect_regex;			/* http-check expected content */
+	struct my_regex *expect_regex;		/* http-check expected content */
 	struct chunk errmsg[HTTP_ERR_SIZE];	/* default or customized error messages for known errors */
 	int uuid;				/* universally unique proxy ID, used for SNMP */
 	unsigned int backlog;			/* force the frontend's listen backlog */