logo
down
shadow

Invalid Regex is accepted by Java. Is this a Java bug or a missed interpretation of expectations


Invalid Regex is accepted by Java. Is this a Java bug or a missed interpretation of expectations

By : Catalina Stancu
Date : October 16 2020, 06:10 AM
Any of those help I'd say the links to the regex test tools are wrong (in the PCRE sense of it). I think this is so because of JS implementations handle these matches differently (see: https://github.com/gskinner/regexr/issues/28)
Note that both regexr and regex101 accept ^()* and (^)*. Also, Perl v5.18.2 has no issue with it: running echo "ubar" | perl -ne "s/^*/F/; print;" from my terminal results in no warnings or errors and will print Fubar.
code :


Share : facebook icon twitter icon
What is missed signal in java? how calling notify() be missed by the waiting thread?

What is missed signal in java? how calling notify() be missed by the waiting thread?


By : Ofek
Date : March 29 2020, 07:55 AM
To fix this issue Signal can be missed if doNotify called before doWait. So doNotify should mark somehow that it was called. The usual way for this is using a variable. Uncomment all usages of wasSignalled and the signal will not be missed.
Java/Hive regex interpretation

Java/Hive regex interpretation


By : Lucky Singh
Date : March 29 2020, 07:55 AM
hop of those help? Straightforward question, it's just difficult to google regex syntax... , First break apart the regex:
code :
^(?:([^,]*)\.?){n}
^(?:([^,]*+)\.?){n}
^(?>([^,]*)\.?){n}
Java regex wildcard not accepted

Java regex wildcard not accepted


By : tossed456
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further [\\s].(?i)[snd] This in your regex ensures that there must a character present inbetween the space and n (followed by zero or more spaces plus ( symbol). But there isn't a character actually. So your regex fails and returns the original string without doing any replacements.
code :
String depends2 = "success(job1) AND n(job2)";
depends2  = depends2.replaceAll("\\s(?i)[snd]\\s*\\(", "");     
System.out.println(depends2);
success(job1) ANDjob2)
\s                       whitespace (\n, \r, \t, \f, and " ")
(?i)                     set flags for this block (case-
                         insensitive) (with ^ and $ matching
                         normally) (with . not matching \n)
                         (matching whitespace and # normally)
[snd]                    any character of: 's', 'n', 'd'
\s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                         more times)
\(                       '('
What's the accepted way to write Java methods where return value may be invalid?

What's the accepted way to write Java methods where return value may be invalid?


By : Pavle Pantovic
Date : March 29 2020, 07:55 AM
should help you out I wouldn't even write the method. There's nothing special about the root that you need a specific method to get its value. The entire method is redundant. You need something to get the root, and you need something to get the value out of any node (and its left and right children too).
I would write two methods:
Having difficulty understanding Java regex interpretation

Having difficulty understanding Java regex interpretation


By : user3608292
Date : March 29 2020, 07:55 AM
With these it helps - only indicates a range if it's within a character class (i.e. square brackets []). Otherwise, it's a normal character like any other. With that in mind, this regex matches the following examples:
"-2" "3" "-700" "436"
Related Posts Related Posts :
  • Static value in for loop
  • Difference between Class c; and Class c=new Class();
  • My question is about Regular Expression in java
  • Why can't I write ch=ch+1; instead of ch++; though they have same meaning
  • Why is this loop changed?
  • Java (Read and write to file)
  • What's ideal debugging setup? window placement etc
  • Java app behind proxy to use http_proxy variable in linux
  • Straight Java/Groovy versus ETL tool (Talend/etc) - what libraries would you use?
  • Performance testing Flex applications
  • How to insert into two different tables in one statement with Java and MySQL?
  • Object Serialization for Undo/Redo Functionality Java
  • How to retrieve the last image from an SDcard in Android?
  • What's the fastest way to draw a Hello World in Java
  • Java error on bilinear interpolation of 16 bit data
  • Java equivalent for database schema changes like South for Django?
  • Java Robot key activity seems to stop working while certain software is running
  • Will using multiple version of a jar in an application cause problems?
  • JSF RuntimeException: Cannot find FacesContext
  • How do i get a particular day from Jan to Dec
  • Hibernate configuration for Mysql 8.0
  • What JVM can run on CPU and GPU?
  • How to cast an image received from a webservice in Binary64 format to actual image?
  • Is there anyway to get the generated keys when using Spring JDBC batchUpdate?
  • How good is Oracle Universal Connection Pool (UCP)
  • How to populate Java (web) application with initial data using Spring/JPA/Hibernate
  • How do I make my frames change in java?
  • Java Swing - Background of a JPanel
  • Printing pdf from extjs - best solution
  • Clean a RandomAccessFile
  • JFileChooser and browsing networked machines
  • How to write Java string literals that contain double-quotes (")?
  • What do I use Artifacts in IntelliJ IDEA for?
  • Bug with Spring Security 3.0.2 x Spring 3.0.1 - Proxies not being created
  • DBunit generates java.lang.ClassCastException: java.lang.String cannot be cast to oracle.sql.CLOB when trying to load a
  • Hibernate configuration - session factory scanning?
  • Enter Key Press behave like Submit in JSF
  • Using protocol buffers for binary logging
  • EasyMock Class Extension mock isn't mocking methods
  • How do I convert a byte array to Base64 in Java?
  • How to modify camel Exchange and send it
  • How do I avoid constructors?
  • Passing string in where clause using PreparedStatement
  • Tomcat 7 - Ignoring db conections pool parameters (DBCP)
  • How does reduce() method work with parallel streams in Java 8?
  • How can I use a generic class with wildcard declaration?
  • Unable to add ArrayList with multiple arguments
  • Move application into second window monitor in javafx
  • does intern() method have implication on performance?
  • How to run NPM Command in Java code using ProcessBuilder
  • Sending HTTP/2 request via Socket in Java
  • eclipse IDE wrong warning that unused field
  • Decode Java enum from single char
  • How to hide embedded dependencies when using an OSGI bundle with maven?
  • How to correctly implement a generic interface in Java
  • send alert to html page from servlet
  • <EOF>Exception while creating Derby table
  • What does stack.pop() return?
  • Problem with Java Language Levels in IntelliJ IDEA
  • How do i get the status code for a response i subscribe to using the JDK's HttpClient?
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk