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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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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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From the following value
[AAMP-PLAYER]aamp pos: [14..187..202..2196879032]
I want to get the last number 2196879032
Some times value will be -1
[AAMP-PLAYER]aamp pos: [14..187..202..-1]
Instead of split method how can i extract last digit using regex method
You could match the last (possibly negative) number at the end of the string, just before the closing ]:
(\-?\d+)\]$
A number is last if it is not followed (following it anywhere, not just immediately) by any other number.
(\-?\d+)(?!.*\d)
We could try using a String#replaceAll option here:
String input = "[AAMP-PLAYER]aamp pos: [14..187..202..2196879032]";
String num = input.replaceAll("^.*\\.\\.(-?\\d+).*$", "$1");
System.out.println(num);
This prints:
2196879032
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How can I cut a string string by words according to a length
String text = "Hello world welcome";
The maximum size of a row must be 15 characters, if you used the substring method I would stay like this
Hello wordl wel
come
and it should not be like that, it should be like that
Hello wordl
welcome
Use Apache Commons Text WordUtils.wrap() method:
String out = WordUtils.wrap("Hello world welcome", 15);
System.out.println(out);
will output:
Hello world
welcome
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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.
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Below are the String values I want to separate the inside brackets value
US Records (100)
Foreign Records (243)
In the string above I want to separate the counts and store into another string
100, 243 using regular expression.
This code schold give you the result:
String s = new String("US Records (100)");
Pattern p = Pattern.compile("\\((\\d+)\\)");
Matcher m = p.matcher(s);
m.find();
System.out.println(m.group(1));