ZREX(3) CZMQ Manual ZREX(3) NAME zrex - Class for work with regular expressions SYNOPSIS // Constructor. Optionally, sets an expression against which we can match // text and capture hits. If there is an error in the expression, reports // zrex_valid() as false and provides the error in zrex_strerror(). If you // set a pattern, you can call zrex_matches() to test it against text. CZMQ_EXPORT zrex_t * zrex_new (const char *expression); // Destructor CZMQ_EXPORT void zrex_destroy (zrex_t **self_p); // Return true if the expression was valid and compiled without errors. CZMQ_EXPORT bool zrex_valid (zrex_t *self); // Return the error message generated during compilation of the expression. CZMQ_EXPORT const char * zrex_strerror (zrex_t *self); // Returns true if the text matches the previously compiled expression. // Use this method to compare one expression against many strings. CZMQ_EXPORT bool zrex_matches (zrex_t *self, const char *text); // Returns true if the text matches the supplied expression. Use this // method to compare one string against several expressions. CZMQ_EXPORT bool zrex_eq (zrex_t *self, const char *text, const char *expression); // Returns number of hits from last zrex_matches or zrex_eq. If the text // matched, returns 1 plus the number of capture groups. If the text did // not match, returns zero. To retrieve individual capture groups, call // zrex_hit (). CZMQ_EXPORT int zrex_hits (zrex_t *self); // Returns the Nth capture group from the last expression match, where // N is 0 to the value returned by zrex_hits(). Capture group 0 is the // whole matching string. Sequence 1 is the first capture group, if any, // and so on. CZMQ_EXPORT const char * zrex_hit (zrex_t *self, uint index); // Fetches hits into string variables provided by caller; this makes for // nicer code than accessing hits by index. Caller should not modify nor // free the returned values. Returns number of strings returned. This // method starts at hit 1, i.e. first capture group, as hit 0 is always // the original matched string. CZMQ_EXPORT int zrex_fetch (zrex_t *self, const char **string_p, ...); // Self test of this class CZMQ_EXPORT void zrex_test (bool verbose); Please add '@interface' section in './../src/zrex.c'. DESCRIPTION Wraps a very simple regular expression library (SLRE) as a CZMQ class. Sup- ports this syntax: ^ Match beginning of a buffer $ Match end of a buffer () Grouping and substring capturing [...] Match any character from set [^...] Match any character but ones from set . Match any character \s Match whitespace \S Match non-whitespace \d Match decimal digit \D Match non decimal digit \a Match alphabetic character \A Match non-alphabetic character \w Match alphanumeric character \W Match non-alphanumeric character \r Match carriage return \n Match newline + Match one or more times (greedy) +? Match one or more times (non-greedy) * Match zero or more times (greedy) *? Match zero or more times (non-greedy) ? Match zero or once \xDD Match byte with hex value 0xDD \meta Match one of the meta character: ^$().[*+?\ Please add @discuss section in ./../src/zrex.c. EXAMPLE From zrex_test method. // This shows the pattern of matching many lines to a single pattern zrex_t *rex = zrex_new ("\\d+-\\d+-\\d+"); assert (rex); assert (zrex_valid (rex)); bool matches = zrex_matches (rex, "123-456-789"); assert (matches); assert (zrex_hits (rex) == 1); assert (streq (zrex_hit (rex, 0), "123-456-789")); assert (zrex_hit (rex, 1) == NULL); zrex_destroy (&rex); // Here we pick out hits using capture groups rex = zrex_new ("(\\d+)-(\\d+)-(\\d+)"); assert (rex); assert (zrex_valid (rex)); matches = zrex_matches (rex, "123-456-ABC"); assert (!matches); matches = zrex_matches (rex, "123-456-789"); assert (matches); assert (zrex_hits (rex) == 4); assert (streq (zrex_hit (rex, 0), "123-456-789")); assert (streq (zrex_hit (rex, 1), "123")); assert (streq (zrex_hit (rex, 2), "456")); assert (streq (zrex_hit (rex, 3), "789")); zrex_destroy (&rex); // This shows the pattern of matching one line against many // patterns and then handling the case when it hits rex = zrex_new (NULL); // No initial pattern assert (rex); char *input = "Mechanism: CURVE"; matches = zrex_eq (rex, input, "Version: (.+)"); assert (!matches); assert (zrex_hits (rex) == 0); matches = zrex_eq (rex, input, "Mechanism: (.+)"); assert (matches); assert (zrex_hits (rex) == 2); const char *mechanism; zrex_fetch (rex, &mechanism, NULL); assert (streq (zrex_hit (rex, 1), "CURVE")); assert (streq (mechanism, "CURVE")); zrex_destroy (&rex); #if defined (__WINDOWS__) zsys_shutdown(); #endif AUTHORS The czmq manual was written by the authors in the AUTHORS file. RESOURCES Main web site: Report bugs to the email <zeromq-dev@lists.zeromq.org[1]> COPYRIGHT Copyright (c) the Contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for 0MQ: http://czmq.zeromq.org. This Source Code Form is subject to the terms of the Mozilla Public Li- cense, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. LICENSE included with the czmq distribution. NOTES 1. zeromq-dev@lists.zeromq.org mailto:zeromq-dev@lists.zeromq.org CZMQ 4.2.1 08/27/2026 ZREX(3)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | AUTHORS | RESOURCES | COPYRIGHT | NOTES
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