Then you need two regexprocessfactory steps
> Am 20.02.2019 um 08:12 schrieb Zheng Lin Edwin Yeo <edwinye...@gmail.com>:
>
> Hi,
>
> Thanks for the reply.
>
> Do you know of any regex online tool that works correctly for Java regex?
> I tried to find some, but they are not working properly.
>
> Yes, our plan is to replace more than one \n with <br><br>, and single \n
> with single <br>.
>
> Regards,
> Edwin
>
>> On Wed, 20 Feb 2019 at 14:59, Jörn Franke <jornfra...@gmail.com> wrote:
>>
>> Solr uses Java regex matching, so i doubt there is a bug - it would then
>> be in the JDK. Try out in a regex online Tool that supports Java regex for
>> your solution.
>>
>> I believe you want to have 2 regex process factories:
>> One that deals with single \n and one that deals with more than one \n
>>
>>> Am 20.02.2019 um 06:17 schrieb Zheng Lin Edwin Yeo <edwinye...@gmail.com
>>> :
>>>
>>> Hi,
>>>
>>> We have tried with the following pattern ([ \t]*\r?\n){2,} and
>>> configuration:
>>>
>>> <processor class="solr.RegexReplaceProcessorFactory">
>>> <str name="fieldName">content</str>
>>> <str name="pattern">([ \t]*\r?\n){2,}</str>
>>> <str name="replacement"><br><br></str>
>>> <bool name="literalReplacement">true</bool>
>>> </processor>
>>>
>>> However, the issue is still occurring.
>>>
>>> Anyone else is able to help?
>>>
>>> Regards,
>>> Edwin
>>>
>>> On Fri, 15 Feb 2019 at 11:47, Zheng Lin Edwin Yeo <edwinye...@gmail.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> For your info, this issue is occurring in Solr 7.7.0 as well.
>>>>
>>>> Regards,
>>>> Edwin
>>>>
>>>> On Tue, 12 Feb 2019 at 00:10, Zheng Lin Edwin Yeo <edwinye...@gmail.com
>>>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> Should we report this as a bug in Solr?
>>>>>
>>>>> Regards,
>>>>> Edwin
>>>>>
>>>>> On Fri, 8 Feb 2019 at 22:18, Zheng Lin Edwin Yeo <edwinye...@gmail.com
>>>
>>>>> wrote:
>>>>>
>>>>>> Hi Paul,
>>>>>>
>>>>>> Regarding the regex (\n\s*){2,} that we are using, when we try in on
>>>>>> https://regex101.com/, it is able to give us the correct result for
>> all
>>>>>> the examples (ie: All of them will only have <br><br>, and not more
>> than
>>>>>> that like what we are getting in Solr in our earlier examples).
>>>>>>
>>>>>> Could there be a possibility of a bug in Solr?
>>>>>>
>>>>>> Regards,
>>>>>> Edwin
>>>>>>
>>>>>> On Fri, 8 Feb 2019 at 00:33, Zheng Lin Edwin Yeo <
>> edwinye...@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Hi Paul,
>>>>>>>
>>>>>>> We have tried it with the space preceeding the \n i.e. <str
>>>>>>> name="pattern">(\s*\n){2,}</str>, with the following regex pattern:
>>>>>>>
>>>>>>> <processor class="solr.RegexReplaceProcessorFactory">
>>>>>>> <str name="fieldName">content</str>
>>>>>>> <str name="pattern">(\s*\n){2,}</str>
>>>>>>> <str name="replacement"><br><br></str>
>>>>>>> </processor>
>>>>>>>
>>>>>>> However, we are also getting the exact same results as the earlier
>>>>>>> Example 1, 2 and 3.
>>>>>>>
>>>>>>> As for your point 2 on perhaps in the data you have other (non
>>>>>>> printing) characters than \n, we have find that there are no non
>> printing
>>>>>>> characters. It is just next line with a space. You can refer to the
>>>>>>> original content in the same examples below.
>>>>>>>
>>>>>>>
>>>>>>> Example 1: The sentence that the above regex pattern is working
>>>>>>> correctly
>>>>>>> *Original content in EML file:*
>>>>>>> Dear Sir,
>>>>>>>
>>>>>>>
>>>>>>> I am terminating
>>>>>>> *Original content:* Dear Sir, \n\n \n \n\n I am terminating
>>>>>>> *Index content: * Dear Sir, <br><br>I am terminating
>>>>>>>
>>>>>>> Example 2: The sentence that the above regex pattern is partially
>>>>>>> working (as you can see, instead of 2 <br>, there are 4 <br>)
>>>>>>> *Original content in EML file:*
>>>>>>>
>>>>>>> *exalted*
>>>>>>>
>>>>>>> *Psalm 89:17*
>>>>>>>
>>>>>>>
>>>>>>> 3 Choa Chu Kang Avenue 4
>>>>>>> *Original content:* exalted \n \n\n Psalm 89:17 \n\n \n\n 3
>>>>>>> Choa Chu Kang Avenue 4, Singapore
>>>>>>> *Index content: *exalted <br><br>Psalm 89:17 <br><br> <br><br>3
>>>>>>> Choa Chu Kang Avenue 4, Singapore
>>>>>>>
>>>>>>> Example 3: The sentence that the above regex pattern is partially
>>>>>>> working (as you can see, instead of 2 <br>, there are 4 <br>)
>>>>>>> *Original content in EML file:*
>>>>>>>
>>>>>>> http://www.concordpri.moe.edu.sg/
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Dec 18, 2018 at 10:07 AM
>>>>>>> *Original content:* http://www.concordpri.moe.edu.sg/ \n\n \n\n
>> \n
>>>>>>> \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\n \n\n\n On Tue,
>> Dec 18,
>>>>>>> 2018 at 10:07 AM
>>>>>>> *Index content: *http://www.concordpri.moe.edu.sg/ <br><br>
>>>>>>> <br><br>On Tue, Dec 18, 2018 at 10:07 AM
>>>>>>>
>>>>>>>
>>>>>>> Appreciate any other ideas or suggestions that you may have.
>>>>>>>
>>>>>>> Thank you.
>>>>>>>
>>>>>>> Regards,
>>>>>>> Edwin
>>>>>>>
>>>>>>>> On Thu, 7 Feb 2019 at 22:49, <paul.d...@ub.unibe.ch> wrote:
>>>>>>>>
>>>>>>>> Hi Edwin
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 1. Sorry, the pattern was wrong, the space should preceed the \n
>>>>>>>> i.e. <str name="pattern">(\s*\n){2,}</str>
>>>>>>>> 2. Perhaps in the data you have other (non printing) characters
>>>>>>>> than \n?
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Gesendet von Mail<https://go.microsoft.com/fwlink/?LinkId=550986>
>> für
>>>>>>>> Windows 10
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Von: Zheng Lin Edwin Yeo<mailto:edwinye...@gmail.com>
>>>>>>>> Gesendet: Donnerstag, 7. Februar 2019 15:23
>>>>>>>> An: solr-user@lucene.apache.org<mailto:solr-user@lucene.apache.org>
>>>>>>>> Betreff: Re: RegexReplaceProcessorFactory pattern to detect
>> multiple \n
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Hi Paul,
>>>>>>>>
>>>>>>>> We have tried this suggested regex pattern as follow:
>>>>>>>> <processor class="solr.RegexReplaceProcessorFactory">
>>>>>>>> <str name="fieldName">content</str>
>>>>>>>> <str name="pattern">(\n\s*){2,}</str>
>>>>>>>> <str name="replacement"><br><br></str>
>>>>>>>> </processor>
>>>>>>>>
>>>>>>>> But we still have exactly the same problem of Example 1,2 and 3
>> below.
>>>>>>>>
>>>>>>>> Example 1: The sentence that the above regex pattern is working
>>>>>>>> correctly
>>>>>>>> *Original content:* Dear Sir, \n\n \n \n\n I am terminating
>>>>>>>> *Index content: * Dear Sir, <br><br>I am terminating
>>>>>>>>
>>>>>>>> Example 2: The sentence that the above regex pattern is partially
>>>>>>>> working
>>>>>>>> (as you can see, instead of 2 <br>, there are 4 <br>)
>>>>>>>> *Original content:* exalted \n \n\n Psalm 89:17 \n\n \n\n 3
>>>>>>>> Choa
>>>>>>>> Chu Kang Avenue 4, Singapore
>>>>>>>> *Index content: *exalted <br><br>Psalm 89:17 <br><br> <br><br>3
>>>>>>>> Choa
>>>>>>>> Chu Kang Avenue 4, Singapore
>>>>>>>>
>>>>>>>> Example 3: The sentence that the above regex pattern is partially
>>>>>>>> working
>>>>>>>> (as you can see, instead of 2 <br>, there are 4 <br>)
>>>>>>>> *Original content:* http://www.concordpri.moe.edu.sg/ \n\n \n\n
>>>>>>>> \n \n\n
>>>>>>>> \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\n \n\n\n On Tue, Dec
>> 18,
>>>>>>>> 2018
>>>>>>>> at 10:07 AM
>>>>>>>> *Index content: *http://www.concordpri.moe.edu.sg/ <br><br>
>>>>>>>> <br><br>On
>>>>>>>> Tue, Dec 18, 2018 at 10:07 AM
>>>>>>>>
>>>>>>>> Any further suggestion?
>>>>>>>>
>>>>>>>> Thank you.
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Edwin
>>>>>>>>
>>>>>>>>> On Thu, 7 Feb 2019 at 22:20, <paul.d...@ub.unibe.ch> wrote:
>>>>>>>>>
>>>>>>>>> To avoid the «\n+\s*» matching too many \n and then failing on the
>>>>>>>> {2,}
>>>>>>>>> part you could try
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> <str name="pattern">(\n\s*){2,}</str>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> If you also want to match CRLF then
>>>>>>>>>
>>>>>>>>> <str name="pattern">(\r?\n\s*){2,}</str>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Gesendet von Mail<https://go.microsoft.com/fwlink/?LinkId=550986>
>>>>>>>> für
>>>>>>>>> Windows 10
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Von: Zheng Lin Edwin Yeo<mailto:edwinye...@gmail.com>
>>>>>>>>> Gesendet: Donnerstag, 7. Februar 2019 15:10
>>>>>>>>> An: solr-user@lucene.apache.org<mailto:solr-user@lucene.apache.org
>>>
>>>>>>>>> Betreff: Re: RegexReplaceProcessorFactory pattern to detect
>> multiple
>>>>>>>> \n
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Hi Paul,
>>>>>>>>>
>>>>>>>>> Thanks for your reply.
>>>>>>>>>
>>>>>>>>> When I use this pattern:
>>>>>>>>> <processor class="solr.RegexReplaceProcessorFactory">
>>>>>>>>> <str name="fieldName">content</str>
>>>>>>>>> <str name="pattern">(\n+\s*){2,}</str>
>>>>>>>>> <str name="replacement"><br><br></str>
>>>>>>>>> </processor>
>>>>>>>>>
>>>>>>>>> It is working for some sentence within the same content and not
>>>>>>>> working for
>>>>>>>>> some sentences. Please see below for the one that is working and
>>>>>>>> another
>>>>>>>>> that is not working (partially working):
>>>>>>>>>
>>>>>>>>> Example 1: The sentence that the above regex pattern is working
>>>>>>>> correctly
>>>>>>>>> *Original content:* Dear Sir, \n\n \n \n\n I am terminating
>>>>>>>>> *Index content: * Dear Sir, <br><br>I am terminating
>>>>>>>>>
>>>>>>>>> Example 2: The sentence that the above regex pattern is partially
>>>>>>>> working
>>>>>>>>> (as you can see, instead of 2 <br>, there are 4 <br>)
>>>>>>>>> *Original content:* exalted \n \n\n Psalm 89:17 \n\n \n\n 3
>>>>>>>> Choa
>>>>>>>>> Chu Kang Avenue 4, Singapore
>>>>>>>>> *Index content: *exalted <br><br>Psalm 89:17 <br><br> <br><br>3
>>>>>>>> Choa
>>>>>>>>> Chu Kang Avenue 4, Singapore
>>>>>>>>>
>>>>>>>>> Example 3: The sentence that the above regex pattern is partially
>>>>>>>> working
>>>>>>>>> (as you can see, instead of 2 <br>, there are 4 <br>)
>>>>>>>>> *Original content:* http://www.concordpri.moe.edu.sg/ \n\n
>> \n\n
>>>>>>>> \n
>>>>>>>>> \n\n
>>>>>>>>> \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\n \n\n\n On Tue, Dec
>>>>>>>> 18, 2018
>>>>>>>>> at 10:07 AM
>>>>>>>>> *Index content: *http://www.concordpri.moe.edu.sg/ <br><br>
>>>>>>>> <br><br>On
>>>>>>>>> Tue, Dec 18, 2018 at 10:07 AM
>>>>>>>>>
>>>>>>>>> We would appreciate your help to see what is wrong?
>>>>>>>>>
>>>>>>>>> Thank you.
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>> Edwin
>>>>>>>>>
>>>>>>>>>> On Thu, 7 Feb 2019 at 21:24, <paul.d...@ub.unibe.ch> wrote:
>>>>>>>>>>
>>>>>>>>>> You don’t say what happens, just that it is not working. I assume
>>>>>>>> nothing
>>>>>>>>>> is replaced? Perhaps the pattern should be
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> <str name="pattern">"(\n\s*){2,}"</str>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> ??
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Gesendet von Mail<https://go.microsoft.com/fwlink/?LinkId=550986>
>>>>>>>> für
>>>>>>>>>> Windows 10
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Von: Zheng Lin Edwin Yeo<mailto:edwinye...@gmail.com>
>>>>>>>>>> Gesendet: Donnerstag, 7. Februar 2019 14:08
>>>>>>>>>> An: solr-user@lucene.apache.org<mailto:
>> solr-user@lucene.apache.org
>>>>>>>>>
>>>>>>>>>> Betreff: RegexReplaceProcessorFactory pattern to detect multiple
>> \n
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>> I am trying to use the RegexReplaceProcessorFactory to remove more
>>>>>>>> than
>>>>>>>>> two
>>>>>>>>>> \n with any number of spaces between them (Eg: \n\n, \n \n, \n \n
>>>>>>>> \n
>>>>>>>>> \n),
>>>>>>>>>> and replace it with two <br>.
>>>>>>>>>>
>>>>>>>>>> I use the following regex pattern and it is working when I test it
>>>>>>>> in
>>>>>>>>>> regex101.com. But it is not working when I put it inside the
>>>>>>>>>> RegexReplaceProcessorFactory as below:
>>>>>>>>>>
>>>>>>>>>> <updateRequestProcessorChain name="removeCode">
>>>>>>>>>> <processor class="solr.RegexReplaceProcessorFactory">
>>>>>>>>>> <str name="fieldName">content</str>
>>>>>>>>>> <str name="pattern">"(\\n\s*){2,}"</str>
>>>>>>>>>> <str name="replacement"><br><br></str>
>>>>>>>>>> </processor>
>>>>>>>>>> </updateRequestProcessorChain>
>>>>>>>>>>
>>>>>>>>>> To explain further about my regex pattern, \s* is instructing the
>>>>>>>> regex
>>>>>>>>> to
>>>>>>>>>> match any \n that have space after and {2,} is instructing the
>>>>>>>> regex to
>>>>>>>>>> match 2 or more occurrence of such pattern (\n).
>>>>>>>>>>
>>>>>>>>>> Please kindly let me know what is wrong and how should I do it?
>>>>>>>>>>
>>>>>>>>>> I am using Solr 7.6.0.
>>>>>>>>>>
>>>>>>>>>> Regards,
>>>>>>>>>> Edwin
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>
