tokenize | 易学教程

tokenize a string keeping delimiters in Python

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Is there any equivalent to str.split in Python that also returns the delimiters? I need to preserve the whitespace layout for my output after processing some of the tokens. Example: >>> s="\tthis is an example" >>> print s.split() ['this', 'is', 'an', 'example'] >>> print what_I_want(s) ['\t', 'this', ' ', 'is', ' ', 'an', ' ', 'example'] Thanks! How about import re splitter = re.compile(r'(\s+|\S+)') splitter.findall(s) >>> re.compile(r'(\s+)').split("\tthis is an example") ['', '\t', 'this', ' ', 'is', ' ', 'an', ' ', 'example'] the re module provides this functionality: >>> import re >>> re

Is there way to boost original term more while using Solr synonyms?

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For example I have synonyms laptop,netbook,notebook in index_synonyms.txt When user search for netbook I want to boost original text more then expanded by synonyms? Is there way to specify this in SynonymFilterFactory? For example use original term twice so his TF will be bigger As far as I know, there is no way to do this with the existing SynonymFilterFactory. But following is a trick you can use to get this behavior. Let's say your field is called title . Create another field which is a copy of this, say title_synonyms . Now ensure that SynonymFilterFactory is used as an analyzer only for

Can a line of Python code know its indentation nesting level?

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问题 From something like this: print(get_indentation_level()) print(get_indentation_level()) print(get_indentation_level()) I would like to get something like this: 1 2 3 Can the code read itself in this way? All I want is the output from the more nested parts of the code to be more nested. In the same way that this makes code easier to read, it would make the output easier to read. Of course I could implement this manually, using e.g. .format() , but what I had in mind was a custom print function

How to make the tokinezer detect empty spaces while using strtok()

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问题 I am designing a c++ program, somewhere in the program i need to detect if there is a blank(empty token) next to the token used know eg. if(token1==start) { token2=strtok(NULL," "); if(token2==NULL) {LCCTR=0;} else {LCCTR=atoi(token2);} so in the previous peice token1 is pointing to start , and i want to check if there is anumber next to the start , so I used token2=strtok(NULL," ") to point to the next token but unfortunattly the strtok function cannot detect empty spaces so it gives me an

How to parse / tokenize an SQL statement in Node.js [closed]

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I'm looking for a way to parse / tokenize SQL statement within a Node.js application, in order to: Tokenize all the "basics" SQL keywords defined in the ISO/IEC 9075 standard or here . Validate the SQL syntax. Find out what the query is gonna do (e.g. read or write?). Do you have any solution or advises peeps? Linked: Any Javascript/Jquery Library To validate SQL statment? I've done research and I found out some ways to do it: Using existing node.js libraries I did a Google search and I didn't found a consensual and popular library to use. I found those ones: simple-sql-parser (22 stars on

What are some practical uses of PHP tokenizer?

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What are practical and day-to-day usage examples of PHP Tokenizer ? Has anyone used this? I use PHP_CodeSniffer for coding style compliance, which is built on the tokeniser. Also, some frameworks (e.g. Symfony 2) use the tokeniser to generate cache files or intermediate class files of PHP code. It's also possible to use the tokeniser to build a source code formatter or syntax highlighter. Basically, anywhere you use PHP code as data you can use the tokeniser. It's much more reliable that trying to parse PHP code with regular expressions or other string processing functions. NikiC I personally

C++ extract polynomial coefficients

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问题 So I have a polynomial that looks like this: -4x^0 + x^1 + 4x^3 - 3x^4 I can tokenize this by space and '+' into: -4x^0, x^1, 4x^3, -, 3x^4 How could I just get the coefficients with the negative sign: -4, 1, 0, 4, -3 x is the only variable that will appear and this will alway appear in order im planning on storing the coefficients in an array with the array index being the exponent so: -4 would be at index 0, 1 would be at index 1, 0 at index 2, 4 at index 3, -3 at index 4 回答1: Once you have

C Tokenizer (and it returns empty too when fields are missing. yay!)

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问题 See also: Is this a good substr() for C? strtok() and friends skip over empty fields, and I do not know how to tell it not to skip but rather return empty in such cases. Similar behavior from most tokenizers I could see, and don't even get me started on sscanf() (but then it never said it would work on empty fields to begin with). I have been on a roll and feeling sleepy as well, so here it goes for review: char* substr(const char* text, int nStartingPos, int nRun) { char* emptyString =

Converting Readability formula into python function

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问题 I was given this formula called FRES (Flesch reading-ease test) that is used to measure the readability of a document: My task is to write a python function that returns the FRES of a text. Hence I need to convert this formula into a python function. I have re-implemented my code from a answer I got to show what I have so far and the result it has given me: import nltk import collections nltk.download('punkt') nltk.download('gutenberg') nltk.download('brown') nltk.download('averaged

Word break in languages without spaces between words (e.g., Asian)?

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I'd like to make MySQL full text search work with Japanese and Chinese text, as well as any other language. The problem is that these languages and probably others do not normally have white space between words. Search is not useful when you must type the same sentence as is in the text. I can not just put a space between every character because English must work too. I would like to solve this problem with PHP or MySQL. Can I configure MySQL to recognize characters which should be their own indexing units? Is there a PHP module that can recognize these characters so I could just throw spaces