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1 | <html> |
2 | <head> | |
3 | <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> | |
4 | <title>Options for Perl Regular Expressions</title> | |
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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h4 class="title"> | |
27 | <a name="boost_regex.ref.syntax_option_type.syntax_option_type_perl"></a><a class="link" href="syntax_option_type_perl.html" title="Options for Perl Regular Expressions">Options | |
28 | for Perl Regular Expressions</a> | |
29 | </h4></div></div></div> | |
30 | <p> | |
31 | One of the following must always be set for perl regular expressions: | |
32 | </p> | |
33 | <div class="informaltable"><table class="table"> | |
34 | <colgroup> | |
35 | <col> | |
36 | <col> | |
37 | <col> | |
38 | </colgroup> | |
39 | <thead><tr> | |
40 | <th> | |
41 | <p> | |
42 | Element | |
43 | </p> | |
44 | </th> | |
45 | <th> | |
46 | <p> | |
47 | Standardized | |
48 | </p> | |
49 | </th> | |
50 | <th> | |
51 | <p> | |
52 | Effect when set | |
53 | </p> | |
54 | </th> | |
55 | </tr></thead> | |
56 | <tbody> | |
57 | <tr> | |
58 | <td> | |
59 | <p> | |
60 | ECMAScript | |
61 | </p> | |
62 | </td> | |
63 | <td> | |
64 | <p> | |
65 | Yes | |
66 | </p> | |
67 | </td> | |
68 | <td> | |
69 | <p> | |
70 | Specifies that the grammar recognized by the regular expression | |
71 | engine uses its normal semantics: that is the same as that given | |
72 | in the ECMA-262, ECMAScript Language Specification, Chapter 15 | |
73 | part 10, RegExp (Regular Expression) Objects (FWD.1). | |
74 | </p> | |
75 | <p> | |
76 | This is functionally identical to the <a class="link" href="../../syntax/perl_syntax.html" title="Perl Regular Expression Syntax">Perl | |
77 | regular expression syntax</a>. | |
78 | </p> | |
79 | <p> | |
80 | Boost.Regex also recognizes all of the perl-compatible <code class="computeroutput"><span class="special">(?...)</span></code> extensions in this mode. | |
81 | </p> | |
82 | </td> | |
83 | </tr> | |
84 | <tr> | |
85 | <td> | |
86 | <p> | |
87 | perl | |
88 | </p> | |
89 | </td> | |
90 | <td> | |
91 | <p> | |
92 | No | |
93 | </p> | |
94 | </td> | |
95 | <td> | |
96 | <p> | |
97 | As above. | |
98 | </p> | |
99 | </td> | |
100 | </tr> | |
101 | <tr> | |
102 | <td> | |
103 | <p> | |
104 | normal | |
105 | </p> | |
106 | </td> | |
107 | <td> | |
108 | <p> | |
109 | No | |
110 | </p> | |
111 | </td> | |
112 | <td> | |
113 | <p> | |
114 | As above. | |
115 | </p> | |
116 | </td> | |
117 | </tr> | |
118 | <tr> | |
119 | <td> | |
120 | <p> | |
121 | JavaScript | |
122 | </p> | |
123 | </td> | |
124 | <td> | |
125 | <p> | |
126 | No | |
127 | </p> | |
128 | </td> | |
129 | <td> | |
130 | <p> | |
131 | As above. | |
132 | </p> | |
133 | </td> | |
134 | </tr> | |
135 | <tr> | |
136 | <td> | |
137 | <p> | |
138 | JScript | |
139 | </p> | |
140 | </td> | |
141 | <td> | |
142 | <p> | |
143 | No | |
144 | </p> | |
145 | </td> | |
146 | <td> | |
147 | <p> | |
148 | As above. | |
149 | </p> | |
150 | </td> | |
151 | </tr> | |
152 | </tbody> | |
153 | </table></div> | |
154 | <p> | |
155 | The following options may also be set when using perl-style regular expressions: | |
156 | </p> | |
157 | <div class="informaltable"><table class="table"> | |
158 | <colgroup> | |
159 | <col> | |
160 | <col> | |
161 | <col> | |
162 | </colgroup> | |
163 | <thead><tr> | |
164 | <th> | |
165 | <p> | |
166 | Element | |
167 | </p> | |
168 | </th> | |
169 | <th> | |
170 | <p> | |
171 | Standardized | |
172 | </p> | |
173 | </th> | |
174 | <th> | |
175 | <p> | |
176 | Effect when set | |
177 | </p> | |
178 | </th> | |
179 | </tr></thead> | |
180 | <tbody> | |
181 | <tr> | |
182 | <td> | |
183 | <p> | |
184 | icase | |
185 | </p> | |
186 | </td> | |
187 | <td> | |
188 | <p> | |
189 | Yes | |
190 | </p> | |
191 | </td> | |
192 | <td> | |
193 | <p> | |
194 | Specifies that matching of regular expressions against a character | |
195 | container sequence shall be performed without regard to case. | |
196 | </p> | |
197 | </td> | |
198 | </tr> | |
199 | <tr> | |
200 | <td> | |
201 | <p> | |
202 | nosubs | |
203 | </p> | |
204 | </td> | |
205 | <td> | |
206 | <p> | |
207 | Yes | |
208 | </p> | |
209 | </td> | |
210 | <td> | |
211 | <p> | |
212 | Specifies that when a regular expression is matched against a | |
213 | character container sequence, then no sub-expression matches | |
214 | are to be stored in the supplied <a class="link" href="../match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> structure. | |
215 | </p> | |
216 | </td> | |
217 | </tr> | |
218 | <tr> | |
219 | <td> | |
220 | <p> | |
221 | optimize | |
222 | </p> | |
223 | </td> | |
224 | <td> | |
225 | <p> | |
226 | Yes | |
227 | </p> | |
228 | </td> | |
229 | <td> | |
230 | <p> | |
231 | Specifies that the regular expression engine should pay more | |
232 | attention to the speed with which regular expressions are matched, | |
233 | and less to the speed with which regular expression objects are | |
234 | constructed. Otherwise it has no detectable effect on the program | |
235 | output. This currently has no effect for Boost.Regex. | |
236 | </p> | |
237 | </td> | |
238 | </tr> | |
239 | <tr> | |
240 | <td> | |
241 | <p> | |
242 | collate | |
243 | </p> | |
244 | </td> | |
245 | <td> | |
246 | <p> | |
247 | Yes | |
248 | </p> | |
249 | </td> | |
250 | <td> | |
251 | <p> | |
252 | Specifies that character ranges of the form <code class="computeroutput"><span class="special">[</span><span class="identifier">a</span><span class="special">-</span><span class="identifier">b</span><span class="special">]</span></code> | |
253 | should be locale sensitive. | |
254 | </p> | |
255 | </td> | |
256 | </tr> | |
257 | <tr> | |
258 | <td> | |
259 | <p> | |
260 | newline_alt | |
261 | </p> | |
262 | </td> | |
263 | <td> | |
264 | <p> | |
265 | No | |
266 | </p> | |
267 | </td> | |
268 | <td> | |
269 | <p> | |
270 | Specifies that the \n character has the same effect as the alternation | |
271 | operator |. Allows newline separated lists to be used as a list | |
272 | of alternatives. | |
273 | </p> | |
274 | </td> | |
275 | </tr> | |
276 | <tr> | |
277 | <td> | |
278 | <p> | |
279 | no_except | |
280 | </p> | |
281 | </td> | |
282 | <td> | |
283 | <p> | |
284 | No | |
285 | </p> | |
286 | </td> | |
287 | <td> | |
288 | <p> | |
289 | Prevents <a class="link" href="../basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a> from throwing | |
290 | an exception when an invalid expression is encountered. | |
291 | </p> | |
292 | </td> | |
293 | </tr> | |
294 | <tr> | |
295 | <td> | |
296 | <p> | |
297 | no_mod_m | |
298 | </p> | |
299 | </td> | |
300 | <td> | |
301 | <p> | |
302 | No | |
303 | </p> | |
304 | </td> | |
305 | <td> | |
306 | <p> | |
307 | Normally Boost.Regex behaves as if the Perl m-modifier is on: | |
308 | so the assertions ^ and $ match after and before embedded newlines | |
309 | respectively, setting this flags is equivalent to prefixing the | |
310 | expression with (?-m). | |
311 | </p> | |
312 | </td> | |
313 | </tr> | |
314 | <tr> | |
315 | <td> | |
316 | <p> | |
317 | no_mod_s | |
318 | </p> | |
319 | </td> | |
320 | <td> | |
321 | <p> | |
322 | No | |
323 | </p> | |
324 | </td> | |
325 | <td> | |
326 | <p> | |
327 | Normally whether Boost.Regex will match "." against | |
328 | a newline character is determined by the match flag <code class="computeroutput"><span class="identifier">match_dot_not_newline</span></code>. Specifying | |
329 | this flag is equivalent to prefixing the expression with <code class="computeroutput"><span class="special">(?-</span><span class="identifier">s</span><span class="special">)</span></code> and therefore causes "." | |
330 | not to match a newline character regardless of whether <code class="computeroutput"><span class="identifier">match_not_dot_newline</span></code> is set | |
331 | in the match flags. | |
332 | </p> | |
333 | </td> | |
334 | </tr> | |
335 | <tr> | |
336 | <td> | |
337 | <p> | |
338 | mod_s | |
339 | </p> | |
340 | </td> | |
341 | <td> | |
342 | <p> | |
343 | No | |
344 | </p> | |
345 | </td> | |
346 | <td> | |
347 | <p> | |
348 | Normally whether Boost.Regex will match "." against | |
349 | a newline character is determined by the match flag <code class="computeroutput"><span class="identifier">match_dot_not_newline</span></code>. Specifying | |
350 | this flag is equivalent to prefixing the expression with <code class="computeroutput"><span class="special">(?</span><span class="identifier">s</span><span class="special">)</span></code> and therefore causes "." | |
351 | to match a newline character regardless of whether <code class="computeroutput"><span class="identifier">match_not_dot_newline</span></code> is set | |
352 | in the match flags. | |
353 | </p> | |
354 | </td> | |
355 | </tr> | |
356 | <tr> | |
357 | <td> | |
358 | <p> | |
359 | mod_x | |
360 | </p> | |
361 | </td> | |
362 | <td> | |
363 | <p> | |
364 | No | |
365 | </p> | |
366 | </td> | |
367 | <td> | |
368 | <p> | |
369 | Turns on the perl x-modifier: causes unescaped whitespace in | |
370 | the expression to be ignored. | |
371 | </p> | |
372 | </td> | |
373 | </tr> | |
374 | <tr> | |
375 | <td> | |
376 | <p> | |
377 | no_empty_expressions | |
378 | </p> | |
379 | </td> | |
380 | <td> | |
381 | <p> | |
382 | No | |
383 | </p> | |
384 | </td> | |
385 | <td> | |
386 | <p> | |
387 | When set then empty expressions/alternatives are prohibited. | |
388 | </p> | |
389 | </td> | |
390 | </tr> | |
391 | <tr> | |
392 | <td> | |
393 | <p> | |
394 | save_subexpression_location | |
395 | </p> | |
396 | </td> | |
397 | <td> | |
398 | <p> | |
399 | No | |
400 | </p> | |
401 | </td> | |
402 | <td> | |
403 | <p> | |
404 | When set then the locations of individual sub-expressions within | |
405 | the <span class="emphasis"><em>original regular expression string</em></span> can | |
406 | be accessed via the <a class="link" href="../basic_regex.html#boost_regex.basic_regex.subexpression"><code class="computeroutput"><span class="identifier">subexpression</span><span class="special">()</span></code></a> | |
407 | member function of <code class="computeroutput"><span class="identifier">basic_regex</span></code>. | |
408 | </p> | |
409 | </td> | |
410 | </tr> | |
411 | </tbody> | |
412 | </table></div> | |
413 | </div> | |
414 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
415 | <td align="left"></td> | |
416 | <td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> | |
417 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
418 | 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>) | |
419 | </p> | |
420 | </div></td> | |
421 | </tr></table> | |
422 | <hr> | |
423 | <div class="spirit-nav"> | |
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