line « Development « Java Regex Q&A

1. Is there a CheckStyle rule to force if else keywords to be on the same line in an if/else ladder?    stackoverflow.com

Based on this question it appears that the default template for CheckStyle will allow if else ladders to separate the if and else with a line break. Meaning I would like ...

2. java regex line    stackoverflow.com

In java i would like to read a file line by line and print the line to the output. I want to solve this with regular expressions.

while (...)
{
  private static java.util.regex.Pattern ...

3. Is there a regular expression for finding/replacing the common start of all lines in a chunk of text?    stackoverflow.com

Imagine this string:

 if(editorPart instanceof ITextEditor){
  ITextEditor editor = (ITextEditor)editorPart;
  selection = (ITextSelection) editor.getSelectionProvider().getSelection();
 }else if( editorPart instanceof MultiPageEditorPart){
  //this would be the case for the XML editor
 ...

4. Regex starting with a zero length line and continuing across lines in Java    stackoverflow.com

I want to match the following: a zero length line, with the match continuing across lines of non-zero length until a particular string is matched in a line. E.g: the match ...

5. Would a regex like this work for these lines of text?    stackoverflow.com

Regex:

String regexp = "([0-9.]{1,15})[ \t]*([0-9]{1,15})[ \t]*([0-9.]{1,15})[ \t]*(\"(.*?)\"\\s+\\((\\d{4})\\)\\s+\\{(.*?)\\})";

1000000103      50   4.5  #1 Single (2006)
2...1.2.12       8   2.7  ...

6. Trying to understand this line of Java, as C# code    stackoverflow.com

See this java code :- s = s.replaceAll( "\\\\", "\\\\\\\\" ).replaceAll( "\\$", "\\\\\\$" ); I sorta don't understand it. It's a regex replace all. I've tried the following C# code...

text = text.RegexReplace("\\\\", "\\\\\\\\");
text = ...

7. Java: Count empty lines in a text file/string    stackoverflow.com

I am using the following code to count empty lines in Java, but this code returns a greater number of empty lines than there are.

int countEmptyLines(String s) {
int result=0;
Pattern regex = ...

8. regex starts with '_' and ends with white space/new line in JAVA    stackoverflow.com

i want to be able to locate this pattern '_* ' meaning starts with '_' and ends with either a white space or a new line. also i have another regex to locate ...

9. do i really need 4 lines of code to get a value from the middle of a string?    stackoverflow.com

I need to get a value from a file path. assume my path looks like any other path:

c:\SomeFolder\SomeOtherfolder\A_Specific_Folder\what_i_want\another_folder\bla.txt

10. Ignore lines in file starting with "#" sign in Java    stackoverflow.com

I'm trying to parse a text file in Java. In this text file, comments(things I don't want to parse) are denoted by a "#" sign at the beginning of the line. I ...

11. Regular Expression ignoring or clipping continuation lines    coderanch.com

This regular expression works as expected in "The Regex Coach": (?m)^(\w+)(?:\s+)??((?:.*(?:[\n]^\s+)?.*)*)? In a Java program, (tested on 1.4.2_3 or 1.5 beta 1) it looks like this (?m)^(\\w+)(?:\\s+)??((?:.*(?:[\\n]^\\s+)?.*)*)? _________________________ ^^^^^^^^^^^^^^ ___________ carets mark the section that does continuation The regex group(1) captures the term "Budgie" and group(2) is its definition: "Active and amusing miniature parrot native to Australia" EXCEPT that in Java, ...

12. Why doesn't my regex pickup this line    coderanch.com

(?m)^(?:[A-Z][a-z,']+?)(\s{0,1}?(?:[A-Z][a-z,']+?)?){0,2} (?:(([A-Z]+?)?\d+?[A-Za-z]?/?(?:\d+)?[a-z]?-?(?:\d+)?)|(\d+?-?\d+?/?\d+?)|(\d+?/\d+?)) (?:[A-Z][a-z,']+?)(\s{0,1}?(?:[A-Z][a-z,']+?)?){0,3} (?:N|S|E|W])?\s{0,1}?(?:(\d+? br [ahutw])|land|o res|studio) \$(?:\d+(?:,\d+)*) [A-Z]+?.*$ String line = South Yarra 5/106 Toorak Rd W 2 br u $566,263 SP HS South Yarra It is related to the W which stands for direction since the match would succeed if this character is removed. I need to anticipate that name of the road can be as long as 3 ...

13. Regular expression and line break problem    forums.oracle.com

14. regular expression for line with some string and without some string    forums.oracle.com

===================text line================== ksfsd MUST_HAVE fasdffasdfasdf fasdfasdflasf MUST_HAVE MUST_NOT_HAVE fsdfasf asdf MUST_NOT_HAVE ...etc fasdf;kasd;fk =========================================== from the text above, only the first line is quailfied because that 's the one which has "MUST_HAVE" and doesn't have "MUST_NOT_HAVE" I found ^(?!(.*MUST_NOT_HAVE))(?>.*MUST_HAVE.*)$ but i'm not 100% sure this is correct, and can be applied the 'MUST_HAVE" and "MUST_NOT_HAVE" cases. Thanks.

15. counting Line of Code using regex    forums.oracle.com

16. handling and count new line in regular expressions....    forums.oracle.com

17. Need advice on negating a whole string line with regular expression    forums.oracle.com