package string;

/**

* 用于删除与指定字符串匹配的子串

*/

public class DeleteString {

// 返回将target串中首个与pattern匹配的子串删除后的字符串

public static String deleteFirst(String target, String pattern) {

int i = target.indexOf(pattern);

if (i == -1)

return target;

return target.substring(0, i) + target.substring(i + pattern.length());

}

// 返回将target串中所有与pattern匹配的子串删除后的字符串

public static String deleteAll(String target, String pattern) {

int i = target.indexOf(pattern);

while (i != -1) {

target = target.substring(0, i)

+ target.substring(i + pattern.length());

i = target.indexOf(pattern, i);

}

return target;

}

public static void main(String[] args) {

String target = "ababdabcdabcabc";

String pattern = "abc";

String replacement = "xy";

System.out.println(target.indexOf(pattern));

System.out.println(target.replaceFirst(pattern, replacement));

System.out.println(target.replaceAll(pattern, replacement));

System.out.println(deleteFirst(target, pattern));

System.out.println(deleteAll(target, pattern));

}

}