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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="boost_regex.format.perl_format"></a><a class="link" href="perl_format.html" title="Perl Format String Syntax">Perl Format String Syntax</a> | |
28 | </h3></div></div></div> | |
29 | <p> | |
30 | Perl-style format strings treat all characters as literals except '$' and | |
31 | '\' which start placeholder and escape sequences respectively. | |
32 | </p> | |
33 | <p> | |
34 | Placeholder sequences specify that some part of what matched the regular | |
35 | expression should be sent to output as follows: | |
36 | </p> | |
37 | <div class="informaltable"><table class="table"> | |
38 | <colgroup> | |
39 | <col> | |
40 | <col> | |
41 | </colgroup> | |
42 | <thead><tr> | |
43 | <th> | |
44 | <p> | |
45 | Placeholder | |
46 | </p> | |
47 | </th> | |
48 | <th> | |
49 | <p> | |
50 | Meaning | |
51 | </p> | |
52 | </th> | |
53 | </tr></thead> | |
54 | <tbody> | |
55 | <tr> | |
56 | <td> | |
57 | <p> | |
58 | $& | |
59 | </p> | |
60 | </td> | |
61 | <td> | |
62 | <p> | |
63 | Outputs what matched the whole expression. | |
64 | </p> | |
65 | </td> | |
66 | </tr> | |
67 | <tr> | |
68 | <td> | |
69 | <p> | |
70 | $MATCH | |
71 | </p> | |
72 | </td> | |
73 | <td> | |
74 | <p> | |
75 | As $& | |
76 | </p> | |
77 | </td> | |
78 | </tr> | |
79 | <tr> | |
80 | <td> | |
81 | <p> | |
82 | ${^MATCH} | |
83 | </p> | |
84 | </td> | |
85 | <td> | |
86 | <p> | |
87 | As $& | |
88 | </p> | |
89 | </td> | |
90 | </tr> | |
91 | <tr> | |
92 | <td> | |
93 | <p> | |
94 | $` | |
95 | </p> | |
96 | </td> | |
97 | <td> | |
98 | <p> | |
99 | Outputs the text between the end of the last match found (or the | |
100 | start of the text if no previous match was found), and the start | |
101 | of the current match. | |
102 | </p> | |
103 | </td> | |
104 | </tr> | |
105 | <tr> | |
106 | <td> | |
107 | <p> | |
108 | $PREMATCH | |
109 | </p> | |
110 | </td> | |
111 | <td> | |
112 | <p> | |
113 | As $` | |
114 | </p> | |
115 | </td> | |
116 | </tr> | |
117 | <tr> | |
118 | <td> | |
119 | <p> | |
120 | ${^PREMATCH} | |
121 | </p> | |
122 | </td> | |
123 | <td> | |
124 | <p> | |
125 | As $` | |
126 | </p> | |
127 | </td> | |
128 | </tr> | |
129 | <tr> | |
130 | <td> | |
131 | <p> | |
132 | $' | |
133 | </p> | |
134 | </td> | |
135 | <td> | |
136 | <p> | |
137 | Outputs all the text following the end of the current match. | |
138 | </p> | |
139 | </td> | |
140 | </tr> | |
141 | <tr> | |
142 | <td> | |
143 | <p> | |
144 | $POSTMATCH | |
145 | </p> | |
146 | </td> | |
147 | <td> | |
148 | <p> | |
149 | As $' | |
150 | </p> | |
151 | </td> | |
152 | </tr> | |
153 | <tr> | |
154 | <td> | |
155 | <p> | |
156 | ${^POSTMATCH} | |
157 | </p> | |
158 | </td> | |
159 | <td> | |
160 | <p> | |
161 | As $' | |
162 | </p> | |
163 | </td> | |
164 | </tr> | |
165 | <tr> | |
166 | <td> | |
167 | <p> | |
168 | $+ | |
169 | </p> | |
170 | </td> | |
171 | <td> | |
172 | <p> | |
173 | Outputs what matched the last marked sub-expression in the regular | |
174 | expression. | |
175 | </p> | |
176 | </td> | |
177 | </tr> | |
178 | <tr> | |
179 | <td> | |
180 | <p> | |
181 | $LAST_PAREN_MATCH | |
182 | </p> | |
183 | </td> | |
184 | <td> | |
185 | <p> | |
186 | As $+ | |
187 | </p> | |
188 | </td> | |
189 | </tr> | |
190 | <tr> | |
191 | <td> | |
192 | <p> | |
193 | $LAST_SUBMATCH_RESULT | |
194 | </p> | |
195 | </td> | |
196 | <td> | |
197 | <p> | |
198 | Outputs what matched the last sub-expression to be actually matched. | |
199 | </p> | |
200 | </td> | |
201 | </tr> | |
202 | <tr> | |
203 | <td> | |
204 | <p> | |
205 | $^N | |
206 | </p> | |
207 | </td> | |
208 | <td> | |
209 | <p> | |
210 | As $LAST_SUBMATCH_RESULT | |
211 | </p> | |
212 | </td> | |
213 | </tr> | |
214 | <tr> | |
215 | <td> | |
216 | <p> | |
217 | $$ | |
218 | </p> | |
219 | </td> | |
220 | <td> | |
221 | <p> | |
222 | Outputs a literal '$' | |
223 | </p> | |
224 | </td> | |
225 | </tr> | |
226 | <tr> | |
227 | <td> | |
228 | <p> | |
229 | $n | |
230 | </p> | |
231 | </td> | |
232 | <td> | |
233 | <p> | |
234 | Outputs what matched the n'th sub-expression. | |
235 | </p> | |
236 | </td> | |
237 | </tr> | |
238 | <tr> | |
239 | <td> | |
240 | <p> | |
241 | ${n} | |
242 | </p> | |
243 | </td> | |
244 | <td> | |
245 | <p> | |
246 | Outputs what matched the n'th sub-expression. | |
247 | </p> | |
248 | </td> | |
249 | </tr> | |
250 | <tr> | |
251 | <td> | |
252 | <p> | |
253 | $+{NAME} | |
254 | </p> | |
255 | </td> | |
256 | <td> | |
257 | <p> | |
258 | Outputs whatever matched the sub-expression named "NAME". | |
259 | </p> | |
260 | </td> | |
261 | </tr> | |
262 | </tbody> | |
263 | </table></div> | |
264 | <p> | |
265 | Any $-placeholder sequence not listed above, results in '$' being treated | |
266 | as a literal. | |
267 | </p> | |
268 | <p> | |
269 | An escape character followed by any character x, outputs that character unless | |
270 | x is one of the escape sequences shown below. | |
271 | </p> | |
272 | <div class="informaltable"><table class="table"> | |
273 | <colgroup> | |
274 | <col> | |
275 | <col> | |
276 | </colgroup> | |
277 | <thead><tr> | |
278 | <th> | |
279 | <p> | |
280 | Escape | |
281 | </p> | |
282 | </th> | |
283 | <th> | |
284 | <p> | |
285 | Meaning | |
286 | </p> | |
287 | </th> | |
288 | </tr></thead> | |
289 | <tbody> | |
290 | <tr> | |
291 | <td> | |
292 | <p> | |
293 | \a | |
294 | </p> | |
295 | </td> | |
296 | <td> | |
297 | <p> | |
298 | Outputs the bell character: '\a'. | |
299 | </p> | |
300 | </td> | |
301 | </tr> | |
302 | <tr> | |
303 | <td> | |
304 | <p> | |
305 | \e | |
306 | </p> | |
307 | </td> | |
308 | <td> | |
309 | <p> | |
310 | Outputs the ANSI escape character (code point 27). | |
311 | </p> | |
312 | </td> | |
313 | </tr> | |
314 | <tr> | |
315 | <td> | |
316 | <p> | |
317 | \f | |
318 | </p> | |
319 | </td> | |
320 | <td> | |
321 | <p> | |
322 | Outputs a form feed character: '\f' | |
323 | </p> | |
324 | </td> | |
325 | </tr> | |
326 | <tr> | |
327 | <td> | |
328 | <p> | |
329 | \n | |
330 | </p> | |
331 | </td> | |
332 | <td> | |
333 | <p> | |
334 | Outputs a newline character: '\n'. | |
335 | </p> | |
336 | </td> | |
337 | </tr> | |
338 | <tr> | |
339 | <td> | |
340 | <p> | |
341 | \r | |
342 | </p> | |
343 | </td> | |
344 | <td> | |
345 | <p> | |
346 | Outputs a carriage return character: '\r'. | |
347 | </p> | |
348 | </td> | |
349 | </tr> | |
350 | <tr> | |
351 | <td> | |
352 | <p> | |
353 | \t | |
354 | </p> | |
355 | </td> | |
356 | <td> | |
357 | <p> | |
358 | Outputs a tab character: '\t'. | |
359 | </p> | |
360 | </td> | |
361 | </tr> | |
362 | <tr> | |
363 | <td> | |
364 | <p> | |
365 | \v | |
366 | </p> | |
367 | </td> | |
368 | <td> | |
369 | <p> | |
370 | Outputs a vertical tab character: '\v'. | |
371 | </p> | |
372 | </td> | |
373 | </tr> | |
374 | <tr> | |
375 | <td> | |
376 | <p> | |
377 | \xDD | |
378 | </p> | |
379 | </td> | |
380 | <td> | |
381 | <p> | |
382 | Outputs the character whose hexadecimal code point is 0xDD | |
383 | </p> | |
384 | </td> | |
385 | </tr> | |
386 | <tr> | |
387 | <td> | |
388 | <p> | |
389 | \x{DDDD} | |
390 | </p> | |
391 | </td> | |
392 | <td> | |
393 | <p> | |
394 | Outputs the character whose hexadecimal code point is 0xDDDDD | |
395 | </p> | |
396 | </td> | |
397 | </tr> | |
398 | <tr> | |
399 | <td> | |
400 | <p> | |
401 | \cX | |
402 | </p> | |
403 | </td> | |
404 | <td> | |
405 | <p> | |
406 | Outputs the ANSI escape sequence "escape-X". | |
407 | </p> | |
408 | </td> | |
409 | </tr> | |
410 | <tr> | |
411 | <td> | |
412 | <p> | |
413 | \D | |
414 | </p> | |
415 | </td> | |
416 | <td> | |
417 | <p> | |
418 | If D is a decimal digit in the range 1-9, then outputs the text | |
419 | that matched sub-expression D. | |
420 | </p> | |
421 | </td> | |
422 | </tr> | |
423 | <tr> | |
424 | <td> | |
425 | <p> | |
426 | \l | |
427 | </p> | |
428 | </td> | |
429 | <td> | |
430 | <p> | |
431 | Causes the next character to be outputted, to be output in lower | |
432 | case. | |
433 | </p> | |
434 | </td> | |
435 | </tr> | |
436 | <tr> | |
437 | <td> | |
438 | <p> | |
439 | \u | |
440 | </p> | |
441 | </td> | |
442 | <td> | |
443 | <p> | |
444 | Causes the next character to be outputted, to be output in upper | |
445 | case. | |
446 | </p> | |
447 | </td> | |
448 | </tr> | |
449 | <tr> | |
450 | <td> | |
451 | <p> | |
452 | \L | |
453 | </p> | |
454 | </td> | |
455 | <td> | |
456 | <p> | |
457 | Causes all subsequent characters to be output in lower case, until | |
458 | a \E is found. | |
459 | </p> | |
460 | </td> | |
461 | </tr> | |
462 | <tr> | |
463 | <td> | |
464 | <p> | |
465 | \U | |
466 | </p> | |
467 | </td> | |
468 | <td> | |
469 | <p> | |
470 | Causes all subsequent characters to be output in upper case, until | |
471 | a \E is found. | |
472 | </p> | |
473 | </td> | |
474 | </tr> | |
475 | <tr> | |
476 | <td> | |
477 | <p> | |
478 | \E | |
479 | </p> | |
480 | </td> | |
481 | <td> | |
482 | <p> | |
483 | Terminates a \L or \U sequence. | |
484 | </p> | |
485 | </td> | |
486 | </tr> | |
487 | </tbody> | |
488 | </table></div> | |
489 | </div> | |
490 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
491 | <td align="left"></td> | |
492 | <td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> | |
493 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
494 | 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>) | |
495 | </p> | |
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