使用正则表达式
从较大字符串中提取单引号括起来的字符串的 Java 程序
问题陈述:给定一个字符串，使用 Java Regex 提取用单引号(')括起来的子字符串。
Java regex 是一个用正则表达式进行模式匹配的 API。‘Java . util . regex’是一个用于 CharSequence <接口的类，以便支持与来自各种输入源的字符进行匹配。不允许将空参数传递给任何类或接口，因为它会抛出一个名为<. hence="" it="" can="" be="" concluded="">“Java . util . regex”的异常，该异常包含如下接口和类:
* 连接 1. 匹配结果:匹配操作的结果 * 班级 2. 匹配器:通过解释模式对字符序列进行匹配操作的引擎。 3. 模式:正则表达式的编译表示。
插图:
Input : "Out of this String required only is 'Geeks for Geeks' only'"
Output : Geeks for Geeks
Input : "The data wanted is'Java Regex'"
Output : Java Regex
例
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate extracting
// substring enclosed in single quotes
// Importing Matcher and Pattern class
// from regex class of java.util package
// Importing input output classes
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
// Class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Custom input
String string1
= "Out of this String I want 'Geeks for Geeks' only";
// Desired custom output
String string2
= "The data that I want is'Java Regex'";
// Paranthesis indicate it is a group and signifies
// it can have substring enclosed in single quote
Pattern p = Pattern.compile(".*'([^']*)'.*");
// This method returns a pattern object
// Calling matcher() method of pattern object
// and passing input character sequence
Matcher m1 = p.matcher(string1);
Matcher m2 = p.matcher(string2);
// Printing complete entered string 1
System.out.println("String to be extracted : "
+ string1);
// Condition check using matches() method which
// looks out for content if any in single quote
if (m1.matches()) {
// Print the required sub-string
System.out.println("Extracted part : "
+ m1.group(1));
}
// New line
System.out.println();
// Printing complete entered string 2
System.out.println("String to be extracted : "
+ string2);
// Condition check using matches() method which
// looks out for content if any in single quote
if (m2.matches()) {
// Print the required sub-string
System.out.println("Extracted part : "
+ m2.group(1));
}
}
}
Output
String to be extracted : Out of this String I want 'Geeks for Geeks' only
Extracted part : Geeks for Geeks
String to be extracted : The data that I want is'Java Regex'
Extracted part : Java Regex
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