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25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="boost_regex.ref.posix"></a><a class="link" href="posix.html" title="POSIX Compatible C API's">POSIX Compatible C API's</a> | |
28 | </h3></div></div></div> | |
29 | <div class="note"><table border="0" summary="Note"> | |
30 | <tr> | |
31 | <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td> | |
32 | <th align="left">Note</th> | |
33 | </tr> | |
34 | <tr><td align="left" valign="top"><p> | |
35 | this is an abridged reference to the POSIX API functions, these are provided | |
36 | for compatibility with other libraries, rather than as an API to be used | |
37 | in new code (unless you need access from a language other than C++). This | |
38 | version of these functions should also happily coexist with other versions, | |
39 | as the names used are macros that expand to the actual function names. | |
40 | </p></td></tr> | |
41 | </table></div> | |
42 | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cregex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
43 | </pre> | |
44 | <p> | |
45 | or: | |
46 | </p> | |
47 | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span> | |
48 | </pre> | |
49 | <p> | |
50 | The following functions are available for users who need a POSIX compatible | |
51 | C library, they are available in both Unicode and narrow character versions, | |
52 | the standard POSIX API names are macros that expand to one version or the | |
53 | other depending upon whether UNICODE is defined or not. | |
54 | </p> | |
55 | <div class="important"><table border="0" summary="Important"> | |
56 | <tr> | |
57 | <td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../../../doc/src/images/important.png"></td> | |
58 | <th align="left">Important</th> | |
59 | </tr> | |
60 | <tr><td align="left" valign="top"><p> | |
61 | Note that all the symbols defined here are enclosed inside namespace <code class="computeroutput"><span class="identifier">boost</span></code> when used in C++ programs, unless | |
62 | you use <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span></code> | |
63 | instead - in which case the symbols are still defined in namespace boost, | |
64 | but are made available in the global namespace as well. | |
65 | </p></td></tr> | |
66 | </table></div> | |
67 | <p> | |
68 | The functions are defined as: | |
69 | </p> | |
70 | <pre class="programlisting"><span class="keyword">extern</span> <span class="string">"C"</span> <span class="special">{</span> | |
71 | ||
72 | <span class="keyword">struct</span> <span class="identifier">regex_tA</span><span class="special">;</span> | |
73 | <span class="keyword">struct</span> <span class="identifier">regex_tW</span><span class="special">;</span> | |
74 | ||
75 | <span class="keyword">int</span> <span class="identifier">regcompA</span><span class="special">(</span><span class="identifier">regex_tA</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span> | |
76 | <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regerrorA</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">regex_tA</span><span class="special">*,</span> <span class="keyword">char</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">);</span> | |
77 | <span class="keyword">int</span> <span class="identifier">regexecA</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_tA</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">regmatch_t</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span> | |
78 | <span class="keyword">void</span> <span class="identifier">regfreeA</span><span class="special">(</span><span class="identifier">regex_tA</span><span class="special">*);</span> | |
79 | ||
80 | <span class="keyword">int</span> <span class="identifier">regcompW</span><span class="special">(</span><span class="identifier">regex_tW</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span> | |
81 | <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regerrorW</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">regex_tW</span><span class="special">*,</span> <span class="keyword">wchar_t</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">);</span> | |
82 | <span class="keyword">int</span> <span class="identifier">regexecW</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_tW</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">regmatch_t</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span> | |
83 | <span class="keyword">void</span> <span class="identifier">regfreeW</span><span class="special">(</span><span class="identifier">regex_tW</span><span class="special">*);</span> | |
84 | ||
85 | <span class="preprocessor">#ifdef</span> <span class="identifier">UNICODE</span> | |
86 | <span class="preprocessor">#define</span> <span class="identifier">regcomp</span> <span class="identifier">regcompW</span> | |
87 | <span class="preprocessor">#define</span> <span class="identifier">regerror</span> <span class="identifier">regerrorW</span> | |
88 | <span class="preprocessor">#define</span> <span class="identifier">regexec</span> <span class="identifier">regexecW</span> | |
89 | <span class="preprocessor">#define</span> <span class="identifier">regfree</span> <span class="identifier">regfreeW</span> | |
90 | <span class="preprocessor">#define</span> <span class="identifier">regex_t</span> <span class="identifier">regex_tW</span> | |
91 | <span class="preprocessor">#else</span> | |
92 | <span class="preprocessor">#define</span> <span class="identifier">regcomp</span> <span class="identifier">regcompA</span> | |
93 | <span class="preprocessor">#define</span> <span class="identifier">regerror</span> <span class="identifier">regerrorA</span> | |
94 | <span class="preprocessor">#define</span> <span class="identifier">regexec</span> <span class="identifier">regexecA</span> | |
95 | <span class="preprocessor">#define</span> <span class="identifier">regfree</span> <span class="identifier">regfreeA</span> | |
96 | <span class="preprocessor">#define</span> <span class="identifier">regex_t</span> <span class="identifier">regex_tA</span> | |
97 | <span class="preprocessor">#endif</span> | |
98 | <span class="special">}</span> | |
99 | </pre> | |
100 | <p> | |
101 | All the functions operate on structure regex_t, which exposes two public | |
102 | members: | |
103 | </p> | |
104 | <div class="informaltable"><table class="table"> | |
105 | <colgroup> | |
106 | <col> | |
107 | <col> | |
108 | </colgroup> | |
109 | <thead><tr> | |
110 | <th> | |
111 | <p> | |
112 | Member | |
113 | </p> | |
114 | </th> | |
115 | <th> | |
116 | <p> | |
117 | Meaning | |
118 | </p> | |
119 | </th> | |
120 | </tr></thead> | |
121 | <tbody> | |
122 | <tr> | |
123 | <td> | |
124 | <p> | |
125 | <code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">int</span> | |
126 | <span class="identifier">re_nsub</span></code> | |
127 | </p> | |
128 | </td> | |
129 | <td> | |
130 | <p> | |
131 | This is filled in by <code class="computeroutput"><span class="identifier">regcomp</span></code> | |
132 | and indicates the number of sub-expressions contained in the regular | |
133 | expression. | |
134 | </p> | |
135 | </td> | |
136 | </tr> | |
137 | <tr> | |
138 | <td> | |
139 | <p> | |
140 | <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">TCHAR</span><span class="special">*</span> <span class="identifier">re_endp</span></code> | |
141 | </p> | |
142 | </td> | |
143 | <td> | |
144 | <p> | |
145 | Points to the end of the expression to compile when the flag REG_PEND | |
146 | is set. | |
147 | </p> | |
148 | </td> | |
149 | </tr> | |
150 | </tbody> | |
151 | </table></div> | |
152 | <div class="note"><table border="0" summary="Note"> | |
153 | <tr> | |
154 | <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td> | |
155 | <th align="left">Note</th> | |
156 | </tr> | |
157 | <tr><td align="left" valign="top"><p> | |
158 | <code class="computeroutput"><span class="identifier">regex_t</span></code> is actually a | |
159 | <code class="computeroutput"><span class="preprocessor">#define</span></code> - it is either | |
160 | <code class="computeroutput"><span class="identifier">regex_tA</span></code> or <code class="computeroutput"><span class="identifier">regex_tW</span></code> depending upon whether <code class="computeroutput"><span class="identifier">UNICODE</span></code> is defined or not, <code class="computeroutput"><span class="identifier">TCHAR</span></code> is either <code class="computeroutput"><span class="keyword">char</span></code> | |
161 | or <code class="computeroutput"><span class="keyword">wchar_t</span></code> again depending | |
162 | upon the macro <code class="computeroutput"><span class="identifier">UNICODE</span></code>. | |
163 | </p></td></tr> | |
164 | </table></div> | |
165 | <a name="regcomp"></a><h5> | |
166 | <a name="boost_regex.ref.posix.h0"></a> | |
167 | <span class="phrase"><a name="boost_regex.ref.posix.regcomp"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regcomp">regcomp</a> | |
168 | </h5> | |
169 | <p> | |
170 | <code class="computeroutput"><span class="identifier">regcomp</span></code> takes a pointer to | |
171 | a <code class="computeroutput"><span class="identifier">regex_t</span></code>, a pointer to the | |
172 | expression to compile and a flags parameter which can be a combination of: | |
173 | </p> | |
174 | <div class="informaltable"><table class="table"> | |
175 | <colgroup> | |
176 | <col> | |
177 | <col> | |
178 | </colgroup> | |
179 | <thead><tr> | |
180 | <th> | |
181 | <p> | |
182 | Flag | |
183 | </p> | |
184 | </th> | |
185 | <th> | |
186 | <p> | |
187 | Meaning | |
188 | </p> | |
189 | </th> | |
190 | </tr></thead> | |
191 | <tbody> | |
192 | <tr> | |
193 | <td> | |
194 | <p> | |
195 | REG_EXTENDED | |
196 | </p> | |
197 | </td> | |
198 | <td> | |
199 | <p> | |
200 | Compiles modern regular expressions. Equivalent to <code class="computeroutput"><span class="identifier">regbase</span><span class="special">::</span><span class="identifier">char_classes</span> <span class="special">|</span> | |
201 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">intervals</span> <span class="special">|</span> | |
202 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_refs</span></code>. | |
203 | </p> | |
204 | </td> | |
205 | </tr> | |
206 | <tr> | |
207 | <td> | |
208 | <p> | |
209 | REG_BASIC | |
210 | </p> | |
211 | </td> | |
212 | <td> | |
213 | <p> | |
214 | Compiles basic (obsolete) regular expression syntax. Equivalent | |
215 | to <code class="computeroutput"><span class="identifier">regbase</span><span class="special">::</span><span class="identifier">char_classes</span> <span class="special">|</span> | |
216 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">intervals</span> <span class="special">|</span> | |
217 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">limited_ops</span> <span class="special">|</span> | |
218 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_braces</span> <span class="special">|</span> | |
219 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_parens</span> <span class="special">|</span> | |
220 | <span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_refs</span></code>. | |
221 | </p> | |
222 | </td> | |
223 | </tr> | |
224 | <tr> | |
225 | <td> | |
226 | <p> | |
227 | REG_NOSPEC | |
228 | </p> | |
229 | </td> | |
230 | <td> | |
231 | <p> | |
232 | All characters are ordinary, the expression is a literal string. | |
233 | </p> | |
234 | </td> | |
235 | </tr> | |
236 | <tr> | |
237 | <td> | |
238 | <p> | |
239 | REG_ICASE | |
240 | </p> | |
241 | </td> | |
242 | <td> | |
243 | <p> | |
244 | Compiles for matching that ignores character case. | |
245 | </p> | |
246 | </td> | |
247 | </tr> | |
248 | <tr> | |
249 | <td> | |
250 | <p> | |
251 | REG_NOSUB | |
252 | </p> | |
253 | </td> | |
254 | <td> | |
255 | <p> | |
256 | Has no effect in this library. | |
257 | </p> | |
258 | </td> | |
259 | </tr> | |
260 | <tr> | |
261 | <td> | |
262 | <p> | |
263 | REG_NEWLINE | |
264 | </p> | |
265 | </td> | |
266 | <td> | |
267 | <p> | |
268 | When this flag is set a dot does not match the newline character. | |
269 | </p> | |
270 | </td> | |
271 | </tr> | |
272 | <tr> | |
273 | <td> | |
274 | <p> | |
275 | REG_PEND | |
276 | </p> | |
277 | </td> | |
278 | <td> | |
279 | <p> | |
280 | When this flag is set the re_endp parameter of the regex_t structure | |
281 | must point to the end of the regular expression to compile. | |
282 | </p> | |
283 | </td> | |
284 | </tr> | |
285 | <tr> | |
286 | <td> | |
287 | <p> | |
288 | REG_NOCOLLATE | |
289 | </p> | |
290 | </td> | |
291 | <td> | |
292 | <p> | |
293 | When this flag is set then locale dependent collation for character | |
294 | ranges is turned off. | |
295 | </p> | |
296 | </td> | |
297 | </tr> | |
298 | <tr> | |
299 | <td> | |
300 | <p> | |
301 | REG_ESCAPE_IN_LISTS | |
302 | </p> | |
303 | </td> | |
304 | <td> | |
305 | <p> | |
306 | When this flag is set, then escape sequences are permitted in bracket | |
307 | expressions (character sets). | |
308 | </p> | |
309 | </td> | |
310 | </tr> | |
311 | <tr> | |
312 | <td> | |
313 | <p> | |
314 | REG_NEWLINE_ALT | |
315 | </p> | |
316 | </td> | |
317 | <td> | |
318 | <p> | |
319 | When this flag is set then the newline character is equivalent | |
320 | to the alternation operator |. | |
321 | </p> | |
322 | </td> | |
323 | </tr> | |
324 | <tr> | |
325 | <td> | |
326 | <p> | |
327 | REG_PERL | |
328 | </p> | |
329 | </td> | |
330 | <td> | |
331 | <p> | |
332 | Compiles Perl like regular expressions. | |
333 | </p> | |
334 | </td> | |
335 | </tr> | |
336 | <tr> | |
337 | <td> | |
338 | <p> | |
339 | REG_AWK | |
340 | </p> | |
341 | </td> | |
342 | <td> | |
343 | <p> | |
344 | A shortcut for awk-like behavior: <code class="computeroutput"><span class="identifier">REG_EXTENDED</span> | |
345 | <span class="special">|</span> <span class="identifier">REG_ESCAPE_IN_LISTS</span></code> | |
346 | </p> | |
347 | </td> | |
348 | </tr> | |
349 | <tr> | |
350 | <td> | |
351 | <p> | |
352 | REG_GREP | |
353 | </p> | |
354 | </td> | |
355 | <td> | |
356 | <p> | |
357 | A shortcut for grep like behavior: <code class="computeroutput"><span class="identifier">REG_BASIC</span> | |
358 | <span class="special">|</span> <span class="identifier">REG_NEWLINE_ALT</span></code> | |
359 | </p> | |
360 | </td> | |
361 | </tr> | |
362 | <tr> | |
363 | <td> | |
364 | <p> | |
365 | REG_EGREP | |
366 | </p> | |
367 | </td> | |
368 | <td> | |
369 | <p> | |
370 | A shortcut for egrep like behavior: <code class="computeroutput"><span class="identifier">REG_EXTENDED</span> | |
371 | <span class="special">|</span> <span class="identifier">REG_NEWLINE_ALT</span></code> | |
372 | </p> | |
373 | </td> | |
374 | </tr> | |
375 | </tbody> | |
376 | </table></div> | |
377 | <a name="regerror"></a><h5> | |
378 | <a name="boost_regex.ref.posix.h1"></a> | |
379 | <span class="phrase"><a name="boost_regex.ref.posix.regerror"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regerror">regerror</a> | |
380 | </h5> | |
381 | <p> | |
382 | regerror takes the following parameters, it maps an error code to a human | |
383 | readable string: | |
384 | </p> | |
385 | <div class="informaltable"><table class="table"> | |
386 | <colgroup> | |
387 | <col> | |
388 | <col> | |
389 | </colgroup> | |
390 | <thead><tr> | |
391 | <th> | |
392 | <p> | |
393 | Parameter | |
394 | </p> | |
395 | </th> | |
396 | <th> | |
397 | <p> | |
398 | Meaning | |
399 | </p> | |
400 | </th> | |
401 | </tr></thead> | |
402 | <tbody> | |
403 | <tr> | |
404 | <td> | |
405 | <p> | |
406 | int code | |
407 | </p> | |
408 | </td> | |
409 | <td> | |
410 | <p> | |
411 | The error code. | |
412 | </p> | |
413 | </td> | |
414 | </tr> | |
415 | <tr> | |
416 | <td> | |
417 | <p> | |
418 | const regex_t* e | |
419 | </p> | |
420 | </td> | |
421 | <td> | |
422 | <p> | |
423 | The regular expression (can be null). | |
424 | </p> | |
425 | </td> | |
426 | </tr> | |
427 | <tr> | |
428 | <td> | |
429 | <p> | |
430 | char* buf | |
431 | </p> | |
432 | </td> | |
433 | <td> | |
434 | <p> | |
435 | The buffer to fill in with the error message. | |
436 | </p> | |
437 | </td> | |
438 | </tr> | |
439 | <tr> | |
440 | <td> | |
441 | <p> | |
442 | unsigned int buf_size | |
443 | </p> | |
444 | </td> | |
445 | <td> | |
446 | <p> | |
447 | The length of buf. | |
448 | </p> | |
449 | </td> | |
450 | </tr> | |
451 | </tbody> | |
452 | </table></div> | |
453 | <p> | |
454 | If the error code is OR'ed with REG_ITOA then the message that results is | |
455 | the printable name of the code rather than a message, for example "REG_BADPAT". | |
456 | If the code is REG_ATIO then e must not be null and e->re_pend must point | |
457 | to the printable name of an error code, the return value is then the value | |
458 | of the error code. For any other value of code, the return value is the number | |
459 | of characters in the error message, if the return value is greater than or | |
460 | equal to buf_size then regerror will have to be called again with a larger | |
461 | buffer. | |
462 | </p> | |
463 | <a name="regexec"></a><h5> | |
464 | <a name="boost_regex.ref.posix.h2"></a> | |
465 | <span class="phrase"><a name="boost_regex.ref.posix.regexec"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regexec">regexec</a> | |
466 | </h5> | |
467 | <p> | |
468 | regexec finds the first occurrence of expression e within string buf. If | |
469 | len is non-zero then <span class="emphasis"><em>*m</em></span> is filled in with what matched | |
470 | the regular expression, m[0] contains what matched the whole string, m[1] | |
471 | the first sub-expression etc, see regmatch_t in the header file declaration | |
472 | for more details. The eflags parameter can be a combination of: | |
473 | </p> | |
474 | <div class="informaltable"><table class="table"> | |
475 | <colgroup> | |
476 | <col> | |
477 | <col> | |
478 | </colgroup> | |
479 | <thead><tr> | |
480 | <th> | |
481 | <p> | |
482 | Flag | |
483 | </p> | |
484 | </th> | |
485 | <th> | |
486 | <p> | |
487 | Meaning | |
488 | </p> | |
489 | </th> | |
490 | </tr></thead> | |
491 | <tbody> | |
492 | <tr> | |
493 | <td> | |
494 | <p> | |
495 | REG_NOTBOL | |
496 | </p> | |
497 | </td> | |
498 | <td> | |
499 | <p> | |
500 | Parameter buf does not represent the start of a line. | |
501 | </p> | |
502 | </td> | |
503 | </tr> | |
504 | <tr> | |
505 | <td> | |
506 | <p> | |
507 | REG_NOTEOL | |
508 | </p> | |
509 | </td> | |
510 | <td> | |
511 | <p> | |
512 | Parameter buf does not terminate at the end of a line. | |
513 | </p> | |
514 | </td> | |
515 | </tr> | |
516 | <tr> | |
517 | <td> | |
518 | <p> | |
519 | REG_STARTEND | |
520 | </p> | |
521 | </td> | |
522 | <td> | |
523 | <p> | |
524 | The string searched starts at buf + pmatch[0].rm_so and ends at | |
525 | buf + pmatch[0].rm_eo. | |
526 | </p> | |
527 | </td> | |
528 | </tr> | |
529 | </tbody> | |
530 | </table></div> | |
531 | <a name="regfree"></a><h5> | |
532 | <a name="boost_regex.ref.posix.h3"></a> | |
533 | <span class="phrase"><a name="boost_regex.ref.posix.regfree"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regfree">regfree</a> | |
534 | </h5> | |
535 | <p> | |
536 | <code class="computeroutput"><span class="identifier">regfree</span></code> frees all the memory | |
537 | that was allocated by regcomp. | |
538 | </p> | |
539 | </div> | |
540 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
541 | <td align="left"></td> | |
542 | <td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> | |
543 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
544 | file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) | |
545 | </p> | |
546 | </div></td> | |
547 | </tr></table> | |
548 | <hr> | |
549 | <div class="spirit-nav"> | |
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