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86 lines
3.1 KiB
86 lines
3.1 KiB
11 years ago
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/*
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* Copyright (c) 2004-2013 Sergey Lyubka <valenok@gmail.com>
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* Copyright (c) 2013 Cesanta Limited
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* All rights reserved
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*
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* This library is dual-licensed: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. For the terms of this
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* license, see <http://www.gnu.org/licenses/>.
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*
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* You are free to use this library under the terms of the GNU General
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* Public License, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* Alternatively, you can license this library under a commercial
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* license, as set out in <http://cesanta.com/products.html>.
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*/
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#ifndef SLRE_HEADER_DEFINED
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#define SLRE_HEADER_DEFINED
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/*
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* This is a regular expression library that implements a subset of Perl RE.
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* Please refer to http://cesanta.com/docs/slre for detailed reference.
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*/
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/* This structure describes a matched fragment, a "capture" */
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struct slre_cap {
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const char *ptr; /* Points to the matched fragment */
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int len; /* Length of the matched fragment */
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};
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/*
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* Match string buffer "buf" of length "buf_len" against "regexp", which should
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* conform the syntax outlined below. If regular expression
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* "regexp" contains brackets, slre_match() will capture the respective
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* substring. Array of captures, "caps", must have at least as many elements
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* as number of opening parenthesis in the regexp.
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*
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* Return:
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* 0, if there is no match. error_msg will contain the error message
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* >0, number of bytes matched in a buffer
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*/
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int slre_match(const char *regexp, const char *buf, int buf_len,
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struct slre_cap *caps, const char **error_msg);
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/*
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* Supported syntax:
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* ^ Match beginning of a buffer
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* $ Match end of a buffer
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* () Grouping and substring capturing
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* [...] Match any character from set
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* [^...] Match any character but ones from set
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* \s Match whitespace
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* \S Match non-whitespace
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* \d Match decimal digit
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* \r Match carriage return
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* \n Match newline
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* + Match one or more times (greedy)
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* +? Match one or more times (non-greedy)
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* * Match zero or more times (greedy)
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* *? Match zero or more times (non-greedy)
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* ? Match zero or once
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* \xDD Match byte with hex value 0xDD
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* \meta Match one of the meta character: ^$().[*+\?
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* x|y Match x or y (alternation operator)
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* Usage example: parsing HTTP request line.
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*
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* const char *request = "GET /index.html HTTP/1.0\r\n\r\n";
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* struct slre_capture method, uri, version_min, version_maj;
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*
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* error = slre_match("^\\s*(GET|POST)\\s+(\\S+)\\s+HTTP/(\\d)\\.(\\d)",
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* request, strlen(request),
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* &method, &uri, &version_min, &version_maj);
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*
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* if (error != NULL) {
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* printf("Error parsing HTTP request: %s\n", error);
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* } else {
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* printf("Requested URI: [%.*s]\n", uri.len, uri.ptr);
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* }
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*/
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#endif
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