We just upgraded from opengrok-0.11.1 to opengrok-1.0 to allow access to the history and annotations etc.
However many search strings now need quoted. We used to be able to search for a file path containing unquoted hosts.txt which now finds hundreds of matches vs a quoted search for "hosts.txt" which finds the expected two files. Is there some default we can tweek to change the analyzers being used for different fields. Is this a bug?
According to the OpenGrok help (OpenGrok > Help):
if you want just exact path, enclose it in "", e.g. "src/mypath",
otherwise dividers will be removed and you get more hits
This change happened on 24-Oct-13 due to Lucene changes according to the issue 672 (where you can find more info about).
Related
I've tried the answers I've found in SOF, but none supported here : https://regexr.com
I essentially have an .OPML file with a large number of podcasts and descriptions.
in the following format:
<outline text="Software Engineering Daily" type="rss" xmlUrl="http://softwareengineeringdaily.com/feed/podcast/" htmlUrl="http://softwareengineeringdaily.com" />
What regex I can use to so I can just get the title and the link:
Software Engineering Daily
http://softwareengineeringdaily.com/feed/podcast/
Brief
There are many ways to go about this. The best way is likely using an XML parser. I would definitely read this post that discusses use of regex, especially with XML.
As you can see there are many answers to your question. It also depends on which language you are using since regex engines differ. Some accept backreferences, whilst others do not. I'll post multiple methods below that work in different circumstances/for different regex flavours. You can probably piece together from the multiple regex methods below which parts work best for you.
Code
Method 1
This method works in almost any regex flavour (at least the normal ones).
This method only checks against the attribute value opening and closing marks of " and doesn't include the possibility for whitespace before or after the = symbol. This is the simplest solution to get the values you want.
See regex in use here
\b(text|xmlUrl)="[^"]*"
Similarly, the following methods add more value to the above expression
\b(text|xmlUrl)\s*=\s*"[^"]*" Allows whitespace around =
\b(text|xmlUrl)=(?:"[^"]*"|'[^']*') Allows for ' to be used as attribute value delimiter
As another alternative (following the comments below my answer), if you wanted to grab every attribute except specific ones, you can use the following. Note that I use \w, which should cover most attributes, but you can just replace this with whatever valid characters you want. \S can be used to specify any non-whitespace characters or a set such as [\w-] may be used to specify any word or hyphen character. The negation of the specific attributes occurs with (?!text|xmlUrl), which says don't match those characters. Also, note that the word boundary \b at the beginning ensures that we're matching the full attribute name of text and not the possibility of other attributes with the same termination such as subtext.
\b((?!text|xmlUrl)\w+)="[^"]*"
Method 2
This method only works with regex flavours that allow backreferences. Apparently JGsoft applications, Delphi, Perl, Python, Ruby, PHP, R, Boost, and Tcl support single-digit backreferences. Double-digit backreferences are supported by JGsoft applications, Delphi, Python, and Boost. Information according this article about numbered backreferences from Regular-Expressions.info
See regex in use here
This method uses a backreference to ensure the same closing mark is used at the start and end of the attribute's value and also includes the possibility of whitespace surrounding the = symbol. This doesn't allow the possibility for attributes with no delimiter specified (using xmlUrl=http://softwareengineeringdaily.com/feed/podcast/ may also be valid).
See regex in use here
\b(text|xmlUrl)\s*=\s*(["'])(.*?)\2
Method 3
This method is the same as Method 2 but also allows attributes with no delimiters (note that delimiters are now considered to be space characters, thus, it will only match until the next space).
See regex in use here
\b(text|xmlUrl)\s*=\s*(?:(["'])(.*?)\2|(\S*))
Method 4
While Method 3 works, some people might complain that the attribute values might either of 2 groups. This can be fixed by either of the following methods.
Method 4.A
Branch reset groups are only possible in a few languages, notably JGsoft V2, PCRE 7.2+, PHP, Delphi, R (with PCRE enabled), Boost 1.42+ according to Regular-Expressions.info
This also shows the method you would use if backreferences aren't possible and you wanted to match multiple delimiters ("([^"])"|'([^']*))
See regex in use here
\b(text|xmlUrl)\s*=\s*(?|"([^"]*)"|'([^']*)'|(\S*))
Method 4.B
Duplicate subpatterns are not often supported. See this Regular-Expresions.info article for more information
This method uses the J regex flag, which allows duplicate subpattern names ((?<v>) is in there twice)
See regex in use here
\b(text|xmlUrl)\s*=\s*(?:(["'])(?<v>.*?)\2|(?<v>\S*))
Results
Input
<outline text="Software Engineering Daily" type="rss" xmlUrl="http://softwareengineeringdaily.com/feed/podcast/" htmlUrl="http://softwareengineeringdaily.com" />
Output
Each line below represents a different group. New matches are separated by two lines.
text
Software Engineering Daily
xmlUrl
http://softwareengineeringdaily.com/feed/podcast/
Explanation
I'll explain different parts of the regexes used in the Code section that way you understand the usage of each of these parts. This is more of a reference to the methods above.
"[^"]*" This is the fastest method possible (to the best of my knowledge) to grabbing anything between two " symbols. Note that it does not check for escaped backslashes, it will match any non-" character between two ". Whilst "(.*?)" can also be used, it's slightly slower
(["'])(.*?)\2 is basically shorthand for "(.*?)"|'(.*?)'. You can use any of the following methods to get the same result:
(?:"(.*?)"|'(.*?)')
(?:"([^"])"|'([^']*)') <-- slightly faster than line above
(?|) This is a branch reset group. When you place groups inside it like (?|(x)|(y)) it returns the same group index for both matches. This means that if x is captured, it'll get group index of 1, and if y is captured, it'll also get a group index of 1.
For simple HTML strings you might get along with
Url=(['"])(.+?)\1
Here, take group $2, see a demo on regex101.com.
Obligatory: consider using a parser instead (see here).
I'm setting up a database to do some linguistic analysis, and Japanese Kana are giving me just a bit of trouble.
Unlike other questions on this so far, I don't know that it's an encoding issue, per se. I've set the coallation to utf8_unicode_ci, and on the surface it's saving and recalling most things all right.
The problem, however, is when I get into related kana, such as キ (ki) and ギ (gi). For sorting purposes, Japanese doesn't distinguish between the two unless they are in direct conflict. So for example:
ぎ (gi) comes before きかい (kikai)
きる (kiru) comes before ぎわく (giwaku)
き (ki) comes before ぎ (gi)
It's this behavior that I think is at the root of my problem. When loading my data set from an external file, I had it do a SELECT call to verify that specific readings in Japanese had not already been logged. If it was already there, it would fetch the ID so it could be paired to a headword; otherwise a new entry was added and paired thereafter.
What I noticed after I put everything in is that wherever two such similar readings occurred, the first one encountered would be logged and would then show up as a false positive for the other if it showed up. For example:
キョウ (kyou) appeared first, so characters with ギョウ (gyou) got paired with kyou instead
ズ (zu) appeared before ス (su), so likewise even more characters got incorrectly matched.
I can go through and manually sort it out if need be, but what I would really like to do is set the database up to take a stricter view regarding differentiating between characters (e.g. if the characters have two different UTF-8 code points, treat them as different characters). Is there any way to get this behavior?
You can use utf8_bin to get a collation that compares characters by their Unicode code points.
The utf8_general_ci collation also distinguishes キョウ and ギョウ.
when saving to database
save it as binary
and when calling back change it to Japanese
same problem accorded with me with Arabic language
I have a large database (~2700 entries) of vocabulary. Each row contains an English word, the Japanese equivalent, and other data not relevant to this problem. I have created a facility to search and display the results in a table, but I'm having a small problem with the furigana.
Japanese sentences are written with a mix of Chinese characters (kanji) and the phonetic scripts (kana). Not everyone can read every kanji, and sometimes the same kanji has multiple readings. In those cases, the phoetic kana is placed above the kanji - this is called furigana:
I present these phonetic readings to the user with the <ruby> tag in the following format:
<ruby>
<rb>勉強</rb> <!-- the kanji -->
<rp>（</rp> <!-- define where the phonetic part starts in the string -->
<rt>べんきょう</rt> <!-- the phonetic kana itself -->
<rp>）</rp> <!-- define the end of the phonetic part -->
</ruby>する <!-- the last part is already phonetic so needs no ruby -->
The strings are stored in my database like this:
勉強（べんきょう）する
where anything between the parentheses is the reading for the kanji immediately preceeding it. Storing the strings this way allows fallback for browsers that don't support ruby tags (such as, amazingly, Firefox).
All of this is fine, but the problem comes when a user is searching. If they search for
勉強
Then it will show up. But if they try to search for
勉強する
it won't work, because in the database there is a string defining the phonetic pronunciation in the middle.
The full-width parentheses in the above example are used only to denote this phonetic script. Given this, I am looking for a way to essentially tell the MySQL search to ignore anything it finds between rounded parentheses. I have a basic knowledge of how to do most simple queries in MySQL, but I'm certainly not an expert. I have looked at the docs, but (to me, at least) they are not very user-friendly. Perhaps not very beginner-friendly. I thought it might be possible with some sort of construction involving a regular expression, but I can't figure out how.
Is there a way to do what I want?
As said in How to do a regular expression replace in MySQL?, there seems to be impossible without an user-defined function (you can only replace explicit sequences).
Rather dirty solution: you can tolerate anything between two consecutive Japanese characters, LIKE '勉%強%す%る'. I never suggested that.
Or, you can keep an optional field in your table that potentially contains a version with furigana.
I would advise against using LIKE queries beause you would have to have a % between every single character (since you don't know WHEN furigana will occur) and that could end up creating false positives (like if a valid character appeared between 勉 and 強).
As #Jill-Jênn Vie breifly mentioned, I'd suggest adding a new column to hold the text with furigana.
I'm working on an application which performs searches on Korean text. The problem is that Korean conjugation changes the characters. For example:
하다 + 아요 = 해요
"하다" is the verb "to do" in dictionary form and "아요" is the standard polite-form conjugation. Presumably you are a Japanese speaker, so you know how common such polite forms can be! Note how the 하 changes to 해. Obviously, if users try to search for "하다" in the string "해요", they won't find it. But if users want to see all instances of "하다" in the corpus, we need to be able to return it.
Our solution was two columns: "form" (conjugated form) and "analytic_string" which would represent "해요" as "하다+아요". You could take a similar approach and make a second column containing your sentence without furigana.
The main disadvantages of this approach is that you're effectively doubling your database size and you need to pay special attention when inputting data that the two column have the same data (I found a few rows in my database where the form and the analytic string have different words in them). The advantage is you can easily search your data while ignoring furigana.
It's your standard "size vs. performance" trade-off. Which is more important: size of the database or execution time? Any other solution I can think of involves returning too many rows and then individually analyzing them.
Really getting into MySQL and one thought I've had on mastering one aspect of it is to gather a complete listing of MySQL words. One example of this might be the Reserved Words list, though it appears that's not a complete list; example: CONCAT, CRC32, etc.
Bizarre as it may seem, I was thinking that such a list might exist, or that there might even be a query that would yield it, and/or a way to extract it from the source code of MySQL.
It is a non-scientific method, but what I would do is:
extract all strings from Native_func_registry func_array. Lookup for it sql/item_create.cc , e.g in
http://bazaar.launchpad.net/~mysql/mysql-server/mysql-trunk/view/head:/sql/item_create.cc
Those should cover builtin functions.
extract strings from 'symbols' and 'functions' in lexer :
http://bazaar.launchpad.net/~mysql/mysql-server/mysql-trunk/view/head:/sql/lex.h
extract symbols from bison input http://bazaar.launchpad.net/~mysql/mysql-server/mysql-trunk/view/head:/sql/sql_yacc.yy from lines
%token SOMETOKEN
except when tokens have _SYM suffix (they are covered by sql/lex.h)
Combine all of those, and the resulting set might come near :)
According to Adobe's Manual on PDF Open Parameters PDF files can be opened with certain parameters from command line or from a link in HTML.
These open Parameters include page=pagenum, zoom=scale, comment=commentID and others (the first parameter should be preceded with a # and the next should be preceded with a &
The official PDF Open Parameters from adobe gives this example:
#page=1&comment=452fde0e-fd22-457c-84aa-2cf5bed5a349
but the comment part doesn't work for me!
page=pagenum and zoom=scale work for me well. But comment=commentID does not work. I tried on Adobe reader 6.0.0 and Adobe Pro Extended 9.0.0: I can't get to the specified comment.
Also, I get the comment ID by exporting the comments in XFDF format and in the resulting file, there is a name attribute for every comment that I hope corresponds to the ID (well, the appearance looks like the example in the manual).
I thought maybe there is a setting that I should first enable (or maybe disable in adobe) or maybe I am getting the comment IDs wrong, or maybe something else?!
Any help would be extremely appreciated
According to the docs, you must include a page=X along with your comment=foo. Your copied sample has it, but it's copied from the docs, not something you did yourself.
Are you missing a page= when setting comment?
BASTARDS!
From the last page of the manual you linked:
URL Limitations
●Only one digit following a decimal point is retained for float values.
●Individual parameters, together with their values (separated by & or #), can be no greater then 32 characters in length.
Emphasis added.
The comment ID is a 16-byte value expressed as hex, with four hyphens thrown in to break up the monotony. That's 36 characters right there... starting with "comment=" adds another 8 characters. 44 characters total.
According to that, a comment ID can NEVER WORK, including the samples they show in their docs.
Are you just trying it on the command line, or have you tried via a web browser too? I wonder if that makes a difference. If not, we're looking at a feature that CANNOT WORK. EVER... and probably never has.