Regex expressions work on individual terms. Positional information is irrelevant when it comes to regex matching - it's not matching across terms*.
The syntax allowed is documented here <https://lucene.apache.org/core/4_3_0/core/org/apache/lucene/util/automaton/RegExp.html> - it's not quite the full standard syntax. ^ and $ aren't mentioned there. The beginning of the regex implicitly starts at the beginning of the term. So whatever constitutes a "term" is the granularity of what matches. "string" fields operate on the entire string. A text field that is analyzed will regex match on the individual terms that emerge from the index-time analysis process. Erik * Though with the surround query parser you can do proximity matching using wildcarded terms in sophisticated ways. On May 22, 2013, at 16:42 , Lance Norskog wrote: > If the indexed data includes positions, it should be possible to implement ^ > and $ as the first and last positions. > > On 05/22/2013 04:08 AM, Oussama Jilal wrote: >> There is no ^ or $ in the solr regex since the regular expression will match >> tokens (not the complete indexed text). So the results you get will basicly >> depend on your way of indexing, if you use the regex on a tokenized field >> and that is not what you want, try to use a copy field wich is not tokenized >> and then use the regex on that one. >> >> On 05/22/2013 11:53 AM, Stéphane Habett Roux wrote: >>> I just can't get the $ endpoint to work. >>> >>>> I am not sure but I heard it works with the Java Regex engine (a little >>>> obvious if it is true ...), so any Java regex tutorial would help you. >>>> >>>> On 05/22/2013 11:42 AM, Sagar Chaturvedi wrote: >>>>> Yes, it works for me too. But many times result is not as expected. Is >>>>> there some guide on use of regex in solr? >>>>> >>>>> -----Original Message----- >>>>> From: Oussama Jilal [mailto:jilal.ouss...@gmail.com] >>>>> Sent: Wednesday, May 22, 2013 4:00 PM >>>>> To: solr-user@lucene.apache.org >>>>> Subject: Re: Regular expression in solr >>>>> >>>>> I don't think so, it always worked for me without anything special, just >>>>> try it and see :) >>>>> >>>>> On 05/22/2013 11:26 AM, Sagar Chaturvedi wrote: >>>>>> @Oussama Thank you for your reply. Is it as simple as that? I mean no >>>>>> additional settings required? >>>>>> >>>>>> -----Original Message----- >>>>>> From: Oussama Jilal [mailto:jilal.ouss...@gmail.com] >>>>>> Sent: Wednesday, May 22, 2013 3:37 PM >>>>>> To: solr-user@lucene.apache.org >>>>>> Subject: Re: Regular expression in solr >>>>>> >>>>>> You can write a regular expression query like this (you need to specify >>>>>> the regex between slashes / ) : >>>>>> >>>>>> fieldName:/[rR]egular.*/ >>>>>> >>>>>> On 05/22/2013 10:51 AM, Sagar Chaturvedi wrote: >>>>>>> Hi, >>>>>>> >>>>>>> How do we search based upon regular expressions in solr? >>>>>>> >>>>>>> Regards, >>>>>>> Sagar >>>>>>> >>>>>>> >>>>>>> >>>>>>> DISCLAIMER: >>>>>>> --------------------------------------------------------------------- >>>>>>> - >>>>>>> ------------------------------------------------- >>>>>>> The contents of this e-mail and any attachment(s) are confidential >>>>>>> and intended for the named recipient(s) only. >>>>>>> It shall not attach any liability on the originator or NEC or its >>>>>>> affiliates. 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