* Query replace regex with 2 alternatives
@ 2012-12-07 16:51 Dan Espen
2012-12-07 18:59 ` Barry Margolin
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Dan Espen @ 2012-12-07 16:51 UTC (permalink / raw)
To: help-gnu-emacs
Could use some help on query/replace/regex.
I have an html file full of < and >.
I want to replace only some of the pairs with "[" and "]".
I figured out the match string:
"\\(<\\|>\\)
(typed as)
"\(<\|>\)
but when it comes to the replacement, I'm not clear on how to say,
first match gets [ and second match gets ].
I believe emacs can do it but I don't see it documented.
I see references to \1 \2 but not in the replace string.
--
Dan Espen
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Query replace regex with 2 alternatives
2012-12-07 16:51 Query replace regex with 2 alternatives Dan Espen
@ 2012-12-07 18:59 ` Barry Margolin
2012-12-07 20:06 ` Dan Espen
2012-12-07 20:11 ` Jambunathan K
[not found] ` <mailman.14799.1354910918.855.help-gnu-emacs@gnu.org>
2 siblings, 1 reply; 9+ messages in thread
From: Barry Margolin @ 2012-12-07 18:59 UTC (permalink / raw)
To: help-gnu-emacs
In article <icd2ylg5zz.fsf@home.home>, Dan Espen <despen@verizon.net>
wrote:
> Could use some help on query/replace/regex.
>
> I have an html file full of < and >.
> I want to replace only some of the pairs with "[" and "]".
>
> I figured out the match string:
>
> "\\(<\\|>\\)
>
> (typed as)
>
> "\(<\|>\)
>
> but when it comes to the replacement, I'm not clear on how to say,
> first match gets [ and second match gets ].
Do two separate query-replaces, one to replace < with [, the other to
replace > with ].
> I believe emacs can do it but I don't see it documented.
> I see references to \1 \2 but not in the replace string.
I think what you're talking about is:
<\(.*?\)>
Relace with:
[\1]
Or maybe this is what you mean:
<\|>
Replace with:
\,(if (string-equal \& "<" "[" "]"))
This latter option is only available in interactive mode, not when
calling query-replace-regexp from Elisp.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Query replace regex with 2 alternatives
2012-12-07 18:59 ` Barry Margolin
@ 2012-12-07 20:06 ` Dan Espen
2012-12-07 20:19 ` Tassilo Horn
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Dan Espen @ 2012-12-07 20:06 UTC (permalink / raw)
To: help-gnu-emacs
Barry Margolin <barmar@alum.mit.edu> writes:
> In article <icd2ylg5zz.fsf@home.home>, Dan Espen <despen@verizon.net>
> wrote:
>
>> Could use some help on query/replace/regex.
>>
>> I have an html file full of < and >.
>> I want to replace only some of the pairs with "[" and "]".
>>
>> I figured out the match string:
>>
>> "\\(<\\|>\\)
>>
>> (typed as)
>>
>> "\(<\|>\)
>>
>> but when it comes to the replacement, I'm not clear on how to say,
>> first match gets [ and second match gets ].
>
> Do two separate query-replaces, one to replace < with [, the other to
> replace > with ].
>
>> I believe emacs can do it but I don't see it documented.
>> I see references to \1 \2 but not in the replace string.
>
> I think what you're talking about is:
>
> <\(.*?\)>
> Relace with:
> [\1]
Thanks Barry, that worked for what I wanted and is perhaps better.
> Or maybe this is what you mean:
>
> <\|>
> Replace with:
> \,(if (string-equal \& "<" "[" "]"))
This is what I was asking for.
I pasted both values into emacs and the latter part gave me an
error, (wrong-number-of-arguments if 1). The same error I get if
I try to evaluate the expression. Not important now, I got the idea.
I don't see "\," here:
http://www.gnu.org/software/emacs/manual/html_node/emacs/Regexp-Backslash.html#Regexp-Backslash
http://tinyurl.com/aqod6fv
okay, I do see it here:
http://www.gnu.org/software/emacs/manual/html_node/emacs/Regexp-Replace.html#Regexp-Replace
It would have helped if I looked at the current documentation...
Thanks again.
--
Dan Espen
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Query replace regex with 2 alternatives
2012-12-07 20:06 ` Dan Espen
@ 2012-12-07 20:19 ` Tassilo Horn
[not found] ` <mailman.14801.1354911562.855.help-gnu-emacs@gnu.org>
2012-12-08 5:31 ` Barry Margolin
2 siblings, 0 replies; 9+ messages in thread
From: Tassilo Horn @ 2012-12-07 20:19 UTC (permalink / raw)
To: help-gnu-emacs
Dan Espen <despen@verizon.net> writes:
>> Or maybe this is what you mean:
>>
>> <\|>
>> Replace with:
>> \,(if (string-equal \& "<" "[" "]"))
>
> This is what I was asking for.
> I pasted both values into emacs and the latter part gave me an
> error, (wrong-number-of-arguments if 1).
A paren is wrong. It has to be
\,(if (string-equal \&) "<" "[" "]")
Bye,
Tassilo
^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <mailman.14801.1354911562.855.help-gnu-emacs@gnu.org>]
* Re: Query replace regex with 2 alternatives
[not found] ` <mailman.14801.1354911562.855.help-gnu-emacs@gnu.org>
@ 2012-12-07 21:32 ` Dan Espen
0 siblings, 0 replies; 9+ messages in thread
From: Dan Espen @ 2012-12-07 21:32 UTC (permalink / raw)
To: help-gnu-emacs
Tassilo Horn <tsdh@gnu.org> writes:
> Dan Espen <despen@verizon.net> writes:
>
>>> Or maybe this is what you mean:
>>>
>>> <\|>
>>> Replace with:
>>> \,(if (string-equal \& "<" "[" "]"))
>>
>> This is what I was asking for.
>> I pasted both values into emacs and the latter part gave me an
>> error, (wrong-number-of-arguments if 1).
>
> A paren is wrong. It has to be
>
> \,(if (string-equal \&) "<" "[" "]")
And now, all of a sudden it penetrates my thick head.
Thanks again.
--
Dan Espen
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Query replace regex with 2 alternatives
2012-12-07 20:06 ` Dan Espen
2012-12-07 20:19 ` Tassilo Horn
[not found] ` <mailman.14801.1354911562.855.help-gnu-emacs@gnu.org>
@ 2012-12-08 5:31 ` Barry Margolin
2 siblings, 0 replies; 9+ messages in thread
From: Barry Margolin @ 2012-12-08 5:31 UTC (permalink / raw)
To: help-gnu-emacs
In article <ictxrxeief.fsf@home.home>, Dan Espen <despen@verizon.net>
wrote:
> Barry Margolin <barmar@alum.mit.edu> writes:
> > <\|>
> > Replace with:
> > \,(if (string-equal \& "<" "[" "]"))
>
> This is what I was asking for.
> I pasted both values into emacs and the latter part gave me an
> error, (wrong-number-of-arguments if 1). The same error I get if
> I try to evaluate the expression. Not important now, I got the idea.
Sorry, I misplaced a parenthesis, it should be:
\,(if (string-equal \& "<") "[" "]")
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Query replace regex with 2 alternatives
2012-12-07 16:51 Query replace regex with 2 alternatives Dan Espen
2012-12-07 18:59 ` Barry Margolin
@ 2012-12-07 20:11 ` Jambunathan K
[not found] ` <mailman.14799.1354910918.855.help-gnu-emacs@gnu.org>
2 siblings, 0 replies; 9+ messages in thread
From: Jambunathan K @ 2012-12-07 20:11 UTC (permalink / raw)
To: Dan Espen; +Cc: help-gnu-emacs
Dan Espen <despen@verizon.net> writes:
> Could use some help on query/replace/regex.
>
> I have an html file full of < and >.
> I want to replace only some of the pairs with "[" and "]".
>
> I figured out the match string:
>
> "\\(<\\|>\\)
>
> (typed as)
>
> "\(<\|>\)
>
> but when it comes to the replacement, I'm not clear on how to say,
> first match gets [ and second match gets ].
> I believe emacs can do it but I don't see it documented.
> I see references to \1 \2 but not in the replace string.
rx-to-string is the easiest way to build such an regexp.
C-h f rx
Do this
1. M-x ielm RET
2. Copy the below regexp to the prompt
(rx-to-string '(and (group-n 1 "<")
(group-n 2 (minimal-match
(zero-or-more anything)))
(group-n 3 ">")))
Here is a sample session.
,----
| ELISP> (rx-to-string '(and (group-n 1 "<")
| (group-n 2 (minimal-match
| (zero-or-more anything)))
| (group-n 3 ">")))
| "\\(?:\\(?1:<\\)\\(?2:\\(?:.\\|\n\\)*?\\)\\(?3:>\\)\\)"
`----
3. C-x b file.html
4. M-x reb-change-syntax RET read RET
5. M-x re-builder RET
6. Copy paste the above regexp in to *RE-Builder* buffer
7. You will see the various components highlighted in HTML buffer
8. M-x reb-change-syntax RET string RET
9. You will see the above regexp changed from read syntax to string
syntax. Something like. (Yes, the regexp is on two lines)
"\(?:\(?1:<\)\(?2:\(?:.\|
\)*?\)\(?3:>\)\)"
10. C-M-%
Copy the above regexp without surrounding double quotes RET
<\2> RET
You are done.
--
^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <mailman.14799.1354910918.855.help-gnu-emacs@gnu.org>]
* Re: Query replace regex with 2 alternatives
[not found] ` <mailman.14799.1354910918.855.help-gnu-emacs@gnu.org>
@ 2012-12-08 22:07 ` WJ
2012-12-08 23:03 ` William Gardella
0 siblings, 1 reply; 9+ messages in thread
From: WJ @ 2012-12-08 22:07 UTC (permalink / raw)
To: help-gnu-emacs
Jambunathan K wrote:
> Dan Espen <despen@verizon.net> writes:
>
> > Could use some help on query/replace/regex.
> >
> > I have an html file full of < and >.
> > I want to replace only some of the pairs with "[" and "]".
> >
> > I figured out the match string:
> >
> > "\\(<\\|>\\)
> >
> > (typed as)
> >
> > "\(<\|>\)
> >
> > but when it comes to the replacement, I'm not clear on how to say,
> > first match gets [ and second match gets ].
> > I believe emacs can do it but I don't see it documented.
> > I see references to \1 \2 but not in the replace string.
>
> rx-to-string is the easiest way to build such an regexp.
>
> C-h f rx
>
> Do this
>
> 1. M-x ielm RET
> 2. Copy the below regexp to the prompt
>
> (rx-to-string '(and (group-n 1 "<")
> (group-n 2 (minimal-match
> (zero-or-more anything)))
> (group-n 3 ">")))
>
> Here is a sample session.
>
> ,----
> | ELISP> (rx-to-string '(and (group-n 1 "<")
> | (group-n 2 (minimal-match
> | (zero-or-more anything)))
> | (group-n 3 ">")))
> | "\\(?:\\(?1:<\\)\\(?2:\\(?:.\\|\n\\)*?\\)\\(?3:>\\)\\)"
> `----
>
> 3. C-x b file.html
> 4. M-x reb-change-syntax RET read RET
> 5. M-x re-builder RET
> 6. Copy paste the above regexp in to *RE-Builder* buffer
> 7. You will see the various components highlighted in HTML buffer
> 8. M-x reb-change-syntax RET string RET
> 9. You will see the above regexp changed from read syntax to string
> syntax. Something like. (Yes, the regexp is on two lines)
>
> "\(?:\(?1:<\)\(?2:\(?:.\|
> \)*?\)\(?3:>\)\)"
>
> 10. C-M-%
> Copy the above regexp without surrounding double quotes RET
> <\2> RET
>
> You are done.
Where can the documentation for rx-to-string be found?
^ permalink raw reply [flat|nested] 9+ messages in thread
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-- links below jump to the message on this page --
2012-12-07 16:51 Query replace regex with 2 alternatives Dan Espen
2012-12-07 18:59 ` Barry Margolin
2012-12-07 20:06 ` Dan Espen
2012-12-07 20:19 ` Tassilo Horn
[not found] ` <mailman.14801.1354911562.855.help-gnu-emacs@gnu.org>
2012-12-07 21:32 ` Dan Espen
2012-12-08 5:31 ` Barry Margolin
2012-12-07 20:11 ` Jambunathan K
[not found] ` <mailman.14799.1354910918.855.help-gnu-emacs@gnu.org>
2012-12-08 22:07 ` WJ
2012-12-08 23:03 ` William Gardella
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