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I have some line of Java code like this:
Ball b = new Ball(Util.toPx(X*mR), y);
and I would like to replace this line with this
Ball b = new Ball(X*mR, y);
where X is a double number like 1.25, 1.765 etc.
How to obtain this with Eclipse search-replace feature?
I don't know about eclipse, but on sublime text 2 you can obtain it with the search feature with regex enabled. The regex would be something like:
Util\.toPx\((.*?)\)
And if you want to replace this String for something else you could do:
toPx($1)
It would replace the previous string to
toPx(X*mR)
If you have more groups between parentheses, you can use them on the replace expression with $1, $2, etc.
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How do I get the after last two semicolon's occurrences of a string ?
Example:
Mobiles;Students;Test;Yes;1234
The output should be
Yes;1234
Using a regex replacement, we can try:
String input = "Mobiles;Students;Test;Yes;1234";
String output = input.replaceAll("^.*;([^;]+;[^;]+)$", "$1");
System.out.println(output); // Yes;1234
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Edit 1:
Please don't go by the example in a literal way. The key values can be of any string. Need not include "key" and "col" in them.
For example, the string can be the following
Ravi,India,Married;John,Canada,Single;Robert,Spain,Unknown
So, if I pass Ravi as the key, I should get India and Married as the result.
I am trying to use the Java regex pattern to find the details from a given string. The structure of the string is as follows:
Key1,Key1Col1,Key1Col2;Key2,Key2Col1,Key3Col2;Key3,Key3Col1,Key3Col2
where ; is the delimiter for each record.
My requirement is to accept the Key (which is Key1, Key2 etc.) and return the corresponding values like Key1Col1,Key1Col2 etc.
This would do it:
(?<=^Ravi,|;Ravi,)[^;]+
https://regex101.com/r/Tcmzhd/1
The link above shows PHP but it should work in Java no problem.
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When I use [^abc] it excludes a,b,c but I want to exclude only abc not a,b,c.
Just in principle? There are several ways to do it, depending on your context. You could use a negative lookahead, for example, which will assert what the following string must not look like.
Example text:
aba abc abx
Expression:
\b(?!abc)\w{3}\b
Matches:
aba, abx
You should update your question with context if you want specific help.
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how can I alter text string fields in java to only contain certain alphabetical characters (f,-)
in this format: 2f5-4, 2f6, 8f9
Only numbers f numbers and
numbers f number - numbers
You could use a regular expression to check, if the String in your text field is valid:
\d+f\d+(?:-\d+)?
Java code sample
Pattern pattern = Pattern.compile("\\d+f\\d+(?:-\\d+)?");
for (String s : new String[] {
"2f6", "2f9", "6f10", "5f9-2", "3f4-9"
}) {
System.out.println("String: \""+s+"\" match: "+pattern.matcher(s).matches());
}
Regex expression =>
(([0-9]+)([f])([0-9]*)|(([-])([0-9]*)))\w+
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I am currently writing a game in Java, where words in a string will have to be all changed to equal 5 characters a word.
eg. I am writing in Java
Iamwr iting inJav a
I wonder if anyone knows how I would do this?
First remove spaces between words.
Then split that resulting String to length with 5.
Add a space after every 5 character.