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1 | '\" |
2 | '\" Copyright (c) 1993 The Regents of the University of California. | |
3 | '\" Copyright (c) 1994-1996 Sun Microsystems, Inc. | |
4 | '\" Copyright (c) 2000 Scriptics Corporation. | |
5 | '\" | |
6 | '\" See the file "license.terms" for information on usage and redistribution | |
7 | '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. | |
8 | '\" | |
9 | '\" RCS: @(#) $Id: regsub.n,v 1.9.2.1 2004/10/27 14:23:58 dkf Exp $ | |
10 | '\" | |
11 | '\" The definitions below are for supplemental macros used in Tcl/Tk | |
12 | '\" manual entries. | |
13 | '\" | |
14 | '\" .AP type name in/out ?indent? | |
15 | '\" Start paragraph describing an argument to a library procedure. | |
16 | '\" type is type of argument (int, etc.), in/out is either "in", "out", | |
17 | '\" or "in/out" to describe whether procedure reads or modifies arg, | |
18 | '\" and indent is equivalent to second arg of .IP (shouldn't ever be | |
19 | '\" needed; use .AS below instead) | |
20 | '\" | |
21 | '\" .AS ?type? ?name? | |
22 | '\" Give maximum sizes of arguments for setting tab stops. Type and | |
23 | '\" name are examples of largest possible arguments that will be passed | |
24 | '\" to .AP later. If args are omitted, default tab stops are used. | |
25 | '\" | |
26 | '\" .BS | |
27 | '\" Start box enclosure. From here until next .BE, everything will be | |
28 | '\" enclosed in one large box. | |
29 | '\" | |
30 | '\" .BE | |
31 | '\" End of box enclosure. | |
32 | '\" | |
33 | '\" .CS | |
34 | '\" Begin code excerpt. | |
35 | '\" | |
36 | '\" .CE | |
37 | '\" End code excerpt. | |
38 | '\" | |
39 | '\" .VS ?version? ?br? | |
40 | '\" Begin vertical sidebar, for use in marking newly-changed parts | |
41 | '\" of man pages. The first argument is ignored and used for recording | |
42 | '\" the version when the .VS was added, so that the sidebars can be | |
43 | '\" found and removed when they reach a certain age. If another argument | |
44 | '\" is present, then a line break is forced before starting the sidebar. | |
45 | '\" | |
46 | '\" .VE | |
47 | '\" End of vertical sidebar. | |
48 | '\" | |
49 | '\" .DS | |
50 | '\" Begin an indented unfilled display. | |
51 | '\" | |
52 | '\" .DE | |
53 | '\" End of indented unfilled display. | |
54 | '\" | |
55 | '\" .SO | |
56 | '\" Start of list of standard options for a Tk widget. The | |
57 | '\" options follow on successive lines, in four columns separated | |
58 | '\" by tabs. | |
59 | '\" | |
60 | '\" .SE | |
61 | '\" End of list of standard options for a Tk widget. | |
62 | '\" | |
63 | '\" .OP cmdName dbName dbClass | |
64 | '\" Start of description of a specific option. cmdName gives the | |
65 | '\" option's name as specified in the class command, dbName gives | |
66 | '\" the option's name in the option database, and dbClass gives | |
67 | '\" the option's class in the option database. | |
68 | '\" | |
69 | '\" .UL arg1 arg2 | |
70 | '\" Print arg1 underlined, then print arg2 normally. | |
71 | '\" | |
72 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ | |
73 | '\" | |
74 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. | |
75 | .if t .wh -1.3i ^B | |
76 | .nr ^l \n(.l | |
77 | .ad b | |
78 | '\" # Start an argument description | |
79 | .de AP | |
80 | .ie !"\\$4"" .TP \\$4 | |
81 | .el \{\ | |
82 | . ie !"\\$2"" .TP \\n()Cu | |
83 | . el .TP 15 | |
84 | .\} | |
85 | .ta \\n()Au \\n()Bu | |
86 | .ie !"\\$3"" \{\ | |
87 | \&\\$1 \\fI\\$2\\fP (\\$3) | |
88 | .\".b | |
89 | .\} | |
90 | .el \{\ | |
91 | .br | |
92 | .ie !"\\$2"" \{\ | |
93 | \&\\$1 \\fI\\$2\\fP | |
94 | .\} | |
95 | .el \{\ | |
96 | \&\\fI\\$1\\fP | |
97 | .\} | |
98 | .\} | |
99 | .. | |
100 | '\" # define tabbing values for .AP | |
101 | .de AS | |
102 | .nr )A 10n | |
103 | .if !"\\$1"" .nr )A \\w'\\$1'u+3n | |
104 | .nr )B \\n()Au+15n | |
105 | .\" | |
106 | .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n | |
107 | .nr )C \\n()Bu+\\w'(in/out)'u+2n | |
108 | .. | |
109 | .AS Tcl_Interp Tcl_CreateInterp in/out | |
110 | '\" # BS - start boxed text | |
111 | '\" # ^y = starting y location | |
112 | '\" # ^b = 1 | |
113 | .de BS | |
114 | .br | |
115 | .mk ^y | |
116 | .nr ^b 1u | |
117 | .if n .nf | |
118 | .if n .ti 0 | |
119 | .if n \l'\\n(.lu\(ul' | |
120 | .if n .fi | |
121 | .. | |
122 | '\" # BE - end boxed text (draw box now) | |
123 | .de BE | |
124 | .nf | |
125 | .ti 0 | |
126 | .mk ^t | |
127 | .ie n \l'\\n(^lu\(ul' | |
128 | .el \{\ | |
129 | .\" Draw four-sided box normally, but don't draw top of | |
130 | .\" box if the box started on an earlier page. | |
131 | .ie !\\n(^b-1 \{\ | |
132 | \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' | |
133 | .\} | |
134 | .el \}\ | |
135 | \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' | |
136 | .\} | |
137 | .\} | |
138 | .fi | |
139 | .br | |
140 | .nr ^b 0 | |
141 | .. | |
142 | '\" # VS - start vertical sidebar | |
143 | '\" # ^Y = starting y location | |
144 | '\" # ^v = 1 (for troff; for nroff this doesn't matter) | |
145 | .de VS | |
146 | .if !"\\$2"" .br | |
147 | .mk ^Y | |
148 | .ie n 'mc \s12\(br\s0 | |
149 | .el .nr ^v 1u | |
150 | .. | |
151 | '\" # VE - end of vertical sidebar | |
152 | .de VE | |
153 | .ie n 'mc | |
154 | .el \{\ | |
155 | .ev 2 | |
156 | .nf | |
157 | .ti 0 | |
158 | .mk ^t | |
159 | \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n' | |
160 | .sp -1 | |
161 | .fi | |
162 | .ev | |
163 | .\} | |
164 | .nr ^v 0 | |
165 | .. | |
166 | '\" # Special macro to handle page bottom: finish off current | |
167 | '\" # box/sidebar if in box/sidebar mode, then invoked standard | |
168 | '\" # page bottom macro. | |
169 | .de ^B | |
170 | .ev 2 | |
171 | 'ti 0 | |
172 | 'nf | |
173 | .mk ^t | |
174 | .if \\n(^b \{\ | |
175 | .\" Draw three-sided box if this is the box's first page, | |
176 | .\" draw two sides but no top otherwise. | |
177 | .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c | |
178 | .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c | |
179 | .\} | |
180 | .if \\n(^v \{\ | |
181 | .nr ^x \\n(^tu+1v-\\n(^Yu | |
182 | \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c | |
183 | .\} | |
184 | .bp | |
185 | 'fi | |
186 | .ev | |
187 | .if \\n(^b \{\ | |
188 | .mk ^y | |
189 | .nr ^b 2 | |
190 | .\} | |
191 | .if \\n(^v \{\ | |
192 | .mk ^Y | |
193 | .\} | |
194 | .. | |
195 | '\" # DS - begin display | |
196 | .de DS | |
197 | .RS | |
198 | .nf | |
199 | .sp | |
200 | .. | |
201 | '\" # DE - end display | |
202 | .de DE | |
203 | .fi | |
204 | .RE | |
205 | .sp | |
206 | .. | |
207 | '\" # SO - start of list of standard options | |
208 | .de SO | |
209 | .SH "STANDARD OPTIONS" | |
210 | .LP | |
211 | .nf | |
212 | .ta 5.5c 11c | |
213 | .ft B | |
214 | .. | |
215 | '\" # SE - end of list of standard options | |
216 | .de SE | |
217 | .fi | |
218 | .ft R | |
219 | .LP | |
220 | See the \\fBoptions\\fR manual entry for details on the standard options. | |
221 | .. | |
222 | '\" # OP - start of full description for a single option | |
223 | .de OP | |
224 | .LP | |
225 | .nf | |
226 | .ta 4c | |
227 | Command-Line Name: \\fB\\$1\\fR | |
228 | Database Name: \\fB\\$2\\fR | |
229 | Database Class: \\fB\\$3\\fR | |
230 | .fi | |
231 | .IP | |
232 | .. | |
233 | '\" # CS - begin code excerpt | |
234 | .de CS | |
235 | .RS | |
236 | .nf | |
237 | .ta .25i .5i .75i 1i | |
238 | .. | |
239 | '\" # CE - end code excerpt | |
240 | .de CE | |
241 | .fi | |
242 | .RE | |
243 | .. | |
244 | .de UL | |
245 | \\$1\l'|0\(ul'\\$2 | |
246 | .. | |
247 | .TH regsub n 8.3 Tcl "Tcl Built-In Commands" | |
248 | .BS | |
249 | '\" Note: do not modify the .SH NAME line immediately below! | |
250 | .SH NAME | |
251 | regsub \- Perform substitutions based on regular expression pattern matching | |
252 | .SH SYNOPSIS | |
253 | .VS 8.4 | |
254 | \fBregsub \fR?\fIswitches\fR? \fIexp string subSpec \fR?\fIvarName\fR? | |
255 | .VE 8.4 | |
256 | .BE | |
257 | ||
258 | .SH DESCRIPTION | |
259 | .PP | |
260 | This command matches the regular expression \fIexp\fR against | |
261 | \fIstring\fR, | |
262 | .VS 8.4 | |
263 | and either copies \fIstring\fR to the variable whose name is | |
264 | given by \fIvarName\fR or returns \fIstring\fR if \fIvarName\fR is not | |
265 | present. | |
266 | .VE 8.4 | |
267 | (Regular expression matching is described in the \fBre_syntax\fR | |
268 | reference page.) | |
269 | If there is a match, then while copying \fIstring\fR to \fIvarName\fR | |
270 | .VS 8.4 | |
271 | (or to the result of this command if \fIvarName\fR is not present) | |
272 | .VE 8.4 | |
273 | the portion of \fIstring\fR that | |
274 | matched \fIexp\fR is replaced with \fIsubSpec\fR. | |
275 | If \fIsubSpec\fR contains a ``&'' or ``\e0'', then it is replaced | |
276 | in the substitution with the portion of \fIstring\fR that | |
277 | matched \fIexp\fR. | |
278 | If \fIsubSpec\fR contains a ``\e\fIn\fR'', where \fIn\fR is a digit | |
279 | between 1 and 9, then it is replaced in the substitution with | |
280 | the portion of \fIstring\fR that matched the \fIn\fR-th | |
281 | parenthesized subexpression of \fIexp\fR. | |
282 | Additional backslashes may be used in \fIsubSpec\fR to prevent special | |
283 | interpretation of ``&'' or ``\e0'' or ``\e\fIn\fR'' or | |
284 | backslash. | |
285 | The use of backslashes in \fIsubSpec\fR tends to interact badly | |
286 | with the Tcl parser's use of backslashes, so it's generally | |
287 | safest to enclose \fIsubSpec\fR in braces if it includes | |
288 | backslashes. | |
289 | .LP | |
290 | If the initial arguments to \fBregsub\fR start with \fB\-\fR then | |
291 | they are treated as switches. The following switches are | |
292 | currently supported: | |
293 | .TP 10 | |
294 | \fB\-all\fR | |
295 | All ranges in \fIstring\fR that match \fIexp\fR are found and | |
296 | substitution is performed for each of these ranges. | |
297 | Without this switch only the first | |
298 | matching range is found and substituted. | |
299 | If \fB\-all\fR is specified, then ``&'' and ``\e\fIn\fR'' | |
300 | sequences are handled for each substitution using the information | |
301 | from the corresponding match. | |
302 | .TP 15 | |
303 | \fB\-expanded\fR | |
304 | Enables use of the expanded regular expression syntax where | |
305 | whitespace and comments are ignored. This is the same as specifying | |
306 | the \fB(?x)\fR embedded option (see the \fBre_syntax\fR manual page). | |
307 | .TP 15 | |
308 | \fB\-line\fR | |
309 | Enables newline-sensitive matching. By default, newline is a | |
310 | completely ordinary character with no special meaning. With this | |
311 | flag, `[^' bracket expressions and `.' never match newline, `^' | |
312 | matches an empty string after any newline in addition to its normal | |
313 | function, and `$' matches an empty string before any newline in | |
314 | addition to its normal function. This flag is equivalent to | |
315 | specifying both \fB\-linestop\fR and \fB\-lineanchor\fR, or the | |
316 | \fB(?n)\fR embedded option (see the \fBre_syntax\fR manual page). | |
317 | .TP 15 | |
318 | \fB\-linestop\fR | |
319 | Changes the behavior of `[^' bracket expressions and `.' so that they | |
320 | stop at newlines. This is the same as specifying the \fB(?p)\fR | |
321 | embedded option (see the \fBre_syntax\fR manual page). | |
322 | .TP 15 | |
323 | \fB\-lineanchor\fR | |
324 | Changes the behavior of `^' and `$' (the ``anchors'') so they match the | |
325 | beginning and end of a line respectively. This is the same as | |
326 | specifying the \fB(?w)\fR embedded option (see the \fBre_syntax\fR | |
327 | manual page). | |
328 | .TP 10 | |
329 | \fB\-nocase\fR | |
330 | Upper-case characters in \fIstring\fR will be converted to lower-case | |
331 | before matching against \fIexp\fR; however, substitutions specified | |
332 | by \fIsubSpec\fR use the original unconverted form of \fIstring\fR. | |
333 | .TP 10 | |
334 | \fB\-start\fR \fIindex\fR | |
335 | Specifies a character index offset into the string to start | |
336 | matching the regular expression at. When using this switch, `^' | |
337 | will not match the beginning of the line, and \\A will still | |
338 | match the start of the string at \fIindex\fR. | |
339 | \fIindex\fR will be constrained to the bounds of the input string. | |
340 | .TP 10 | |
341 | \fB\-\|\-\fR | |
342 | Marks the end of switches. The argument following this one will | |
343 | be treated as \fIexp\fR even if it starts with a \fB\-\fR. | |
344 | .PP | |
345 | .VS 8.4 | |
346 | If \fIvarName\fR is supplied, the command returns a count of the | |
347 | number of matching ranges that were found and replaced, otherwise the | |
348 | string after replacement is returned. | |
349 | .VE 8.4 | |
350 | See the manual entry for \fBregexp\fR for details on the interpretation | |
351 | of regular expressions. | |
352 | .SH EXAMPLES | |
353 | Replace (in the string in variable \fIstring\fR) every instance of | |
354 | \fBfoo\fR which is a word by itself with \fBbar\fR: | |
355 | .CS | |
356 | \fBregsub\fR -all {\e<foo\e>} $string bar string | |
357 | .CE | |
358 | .PP | |
359 | Insert double-quotes around the first instance of the word | |
360 | \fBinteresting\fR, however it is capitalised. | |
361 | .CS | |
362 | \fBregsub\fR -nocase {\e<interesting\e>} $string {"&"} string | |
363 | .CE | |
364 | .PP | |
365 | Convert all non-ASCII and Tcl-significant characters into \eu escape | |
366 | sequences by using \fBregsub\fR and \fBsubst\fR in combination: | |
367 | .CS | |
368 | # This RE is just a character class for everything "bad" | |
369 | set RE {[][{}\e$\es\eu0100-\euffff]} | |
370 | ||
371 | # We will substitute with a fragment of Tcl script in brackets | |
372 | set substitution {[format \e\e\e\eu%04x [scan "\e\e&" %c]]} | |
373 | ||
374 | # Now we apply the substitution to get a subst-string that | |
375 | # will perform the computational parts of the conversion. | |
376 | set quoted [subst [\fBregsub\fR -all $RE $string $substitution]] | |
377 | .CE | |
378 | ||
379 | .SH "SEE ALSO" | |
380 | regexp(n), re_syntax(n), subst(n) | |
381 | ||
382 | .SH KEYWORDS | |
383 | match, pattern, regular expression, substitute |