fix code

hutool-core/src/main/java/cn/hutool/core/text/CharSequenceUtil.java

@@ -2552,7 +2552,8 @@ public class CharSequenceUtil extends StrChecker {
 	}
 
 	/**
-	 * 去掉字符包装，如果未被包装则返回原字符串
+	 * 去掉字符包装，如果未被包装则返回原字符串<br>
+	 * 此方法要求prefix和suffix都存在，如果只有一个，不做去除。
 	 *
 	 * @param str    字符串
 	 * @param prefix 前置字符串

hutool-core/src/main/java/cn/hutool/core/text/StrRegionMatcher.java

@@ -4,7 +4,22 @@ import java.io.Serializable;
 import java.util.function.BiPredicate;
 
 /**
- * 字符串区域匹配器，用于匹配字串是头部匹配还是尾部匹配
+ * 字符串区域匹配器，用于匹配字串是头部匹配还是尾部匹配。<br>
+ * offset用于锚定开始或结束位置，正数表示从开始偏移，负数表示从后偏移
+ * <pre>
+ *     a  b  c  d  e  f
+ *     |  |        |  |
+ *     0  1  c  d -2 -1
+ * </pre>
+ * <p>
+ * 例如以下匹配都为{@code true}：
+ * <pre>
+ *     offset    str     strToCheck
+ *       0      abcdef       ab
+ *       1      abcdef       bc
+ *      -1      abcdef       ef
+ *      -2      abcdef       de
+ * </pre>
  *
  * @author looly
  * @since 6.0.0
@@ -14,7 +29,10 @@ public class StrRegionMatcher implements BiPredicate<CharSequence, CharSequence>
 
 	private final boolean ignoreCase;
 	private final boolean ignoreEquals;
-	private final boolean isPrefix;
+	/**
+	 * 匹配位置，正数表示从开始偏移，负数表示从后偏移
+	 */
+	private final int offset;
 
 	/**
 	 * 构造
@@ -24,9 +42,20 @@ public class StrRegionMatcher implements BiPredicate<CharSequence, CharSequence>
 	 * @param isPrefix     {@code true}表示检查开头匹配，{@code false}检查末尾匹配
 	 */
 	public StrRegionMatcher(final boolean ignoreCase, final boolean ignoreEquals, final boolean isPrefix) {
+		this(ignoreCase, ignoreEquals, isPrefix ? 0 : -1);
+	}
+
+	/**
+	 * 构造
+	 *
+	 * @param ignoreCase   是否忽略大小写
+	 * @param ignoreEquals 是否忽略字符串相等的情况
+	 * @param offset       匹配位置，正数表示从开始偏移，负数表示从后偏移
+	 */
+	public StrRegionMatcher(final boolean ignoreCase, final boolean ignoreEquals, final int offset) {
 		this.ignoreCase = ignoreCase;
 		this.ignoreEquals = ignoreEquals;
-		this.isPrefix = isPrefix;
+		this.offset = offset;
 	}
 
 	@Override
@@ -38,9 +67,11 @@ public class StrRegionMatcher implements BiPredicate<CharSequence, CharSequence>
 			return null == str && null == strToCheck;
 		}
 
-		final int toffset = isPrefix ? 0 : str.length() - strToCheck.length();
+		final int strToCheckLength = strToCheck.length();
+		final int toffset = this.offset >= 0 ?
+				this.offset : str.length() - strToCheckLength + this.offset + 1;
 		final boolean matches = str.toString()
-				.regionMatches(ignoreCase, toffset, strToCheck.toString(), 0, strToCheck.length());
+				.regionMatches(ignoreCase, toffset, strToCheck.toString(), 0, strToCheckLength);
 
 		if (matches) {
 			return (false == ignoreEquals) || (false == StrUtil.equals(str, strToCheck, ignoreCase));

hutool-core/src/main/java/cn/hutool/core/text/StrTrimer.java

@@ -7,7 +7,7 @@ import java.util.function.Predicate;
 import java.util.function.UnaryOperator;
 
 /**
- * 字符串头尾去除器<br>
+ * 字符串头尾指定字符去除器<br>
  * 按照断言，除去字符串头尾部的断言为真的字符，如果字符串是{@code null}，依然返回{@code null}。
  *
  * @author looly

hutool-core/src/test/java/cn/hutool/core/text/StrRegionMatcherTest.java

@@ -0,0 +1,56 @@
+package cn.hutool.core.text;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class StrRegionMatcherTest {
+	@Test
+	public void matchPrefixTest() {
+		final StrRegionMatcher matcher = new StrRegionMatcher(
+				false, false, true);
+		final boolean test = matcher.test("abcdef", "ab");
+		Assert.assertTrue(test);
+	}
+
+	@Test
+	public void matchSuffixTest() {
+		final StrRegionMatcher matcher = new StrRegionMatcher(
+				false, false, false);
+		final boolean test = matcher.test("abcdef", "ef");
+		Assert.assertTrue(test);
+	}
+
+	@Test
+	public void matchOffsetTest1() {
+		final StrRegionMatcher matcher = new StrRegionMatcher(
+				false, false, 1);
+		final boolean test = matcher.test("abcdef", "bc");
+		Assert.assertTrue(test);
+	}
+
+	@Test
+	public void matchOffsetTest2() {
+		final StrRegionMatcher matcher = new StrRegionMatcher(
+				false, false, -2);
+		final boolean test = matcher.test("abcdef", "de");
+		Assert.assertTrue(test);
+	}
+
+	@Test
+	public void matchOffsetTest3() {
+		// 部分越界
+		final StrRegionMatcher matcher = new StrRegionMatcher(
+				false, false, 5);
+		final boolean test = matcher.test("abcdef", "de");
+		Assert.assertFalse(test);
+	}
+
+	@Test
+	public void matchOffsetTest4() {
+		// 完全越界
+		final StrRegionMatcher matcher = new StrRegionMatcher(
+				false, false, 6);
+		final boolean test = matcher.test("abcdef", "de");
+		Assert.assertFalse(test);
+	}
+}