I have been trying to figure out how to extract a portion of a string between two special characters ' and " I've been looking into regex, but frankly I cannot understand it.
Example in Java code:
String str="21*90'89\"";
I would like to pull out 89
In general I would just like to know how to extract part of a string between two specific characters please.
Also it would be nice to know how to extract part of the string from the beginning to a specific character like to get 21.
Try this regular expression:
'(.*?)"
As a Java string literal you will have to write it as follows:
"'(.*?)\""
Here is a more complete example demonstrating how to use this regular expression with a Matcher
:
Pattern pattern = Pattern.compile("'(.*?)\"");
Matcher matcher = pattern.matcher(str);
if (matcher.find()) {
System.out.println(matcher.group(1));
}
See it working online: ideone
If you'll always have a string like that (with 3 parts) then this is enough:
String str= "21*90'89\"";
String between = str.split("\"|'")[1];
Another option, if you can assure that your strings will always be in the format you provide, you can use a quick-and-dirty substring/indexOf solution:
str.substring(str.indexOf("'") + 1, str.indexOf("\""));
And to get the second piece of data you asked for:
str.substring(0, str.indexOf("*"));
public static void main(final String[] args) {
final String str = "21*90'89\"";
final Pattern pattern = Pattern.compile("[\\*'\"]");
final String[] result = pattern.split(str);
System.out.println(Arrays.toString(result));
}
Is what you are looking for... The program described above produces:
[21, 90, 89]
String str="abc#defg@lmn!tp?pqr*tsd";
String special="!?@#$%^&*()/<>{}[]:;'`~";
ArrayList<Integer> al=new ArrayList<Integer>();
for(int i=0;i<str.length();i++)
{
for(int j=0;j<special.length();j++)
if(str.charAt(i)==special.charAt(j))
al.add(i);
}
for(int i=0;i<al.size()-1;i++)
{
int start=al.get(i);
int end=al.get(i+1);
for(int j=start+1;j<end;j++)
System.out.print(str.charAt(j));
System.out.print(" ");
}
I'm missing the simplest possible solution here:
str.replaceFirst(".*'(.*)\".*", "$1");
This solution is by far the shortest, however it has some drawbacks:
I wouldn't use it except as a quick hack or if I could be really sure about the input format.
String str= 21*90'89;
String part= str.split("[*|']");
System.out.println(part[0] +""+part[1]);
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.