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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.text.finder;

import cn.hutool.core.lang.Assert;
import cn.hutool.core.text.CharSequenceUtil;

/**
 * 字符串查找器
 *
 * @author looly
 * @since 5.7.14
 */
public class StrFinder extends TextFinder {
	private static final long serialVersionUID = 1L;

	private final CharSequence strToFind;
	private final boolean caseInsensitive;

	/**
	 * 构造
	 *
	 * @param strToFind       被查找的字符串
	 * @param caseInsensitive 是否忽略大小写
	 */
	public StrFinder(CharSequence strToFind, boolean caseInsensitive) {
		Assert.notEmpty(strToFind);
		this.strToFind = strToFind;
		this.caseInsensitive = caseInsensitive;
	}

	@Override
	public int start(int from) {
		Assert.notNull(this.text, "Text to find must be not null!");
		final int subLen = strToFind.length();

		if (from < 0) {
			from = 0;
		}
		int endLimit = getValidEndIndex();
		if (negative) {
			for (int i = from; i > endLimit; i--) {
				if (CharSequenceUtil.isSubEquals(text, i, strToFind, 0, subLen, caseInsensitive)) {
					return i;
				}
			}
		} else {
			endLimit = endLimit - subLen + 1;
			for (int i = from; i < endLimit; i++) {
				if (CharSequenceUtil.isSubEquals(text, i, strToFind, 0, subLen, caseInsensitive)) {
					return i;
				}
			}
		}

		return INDEX_NOT_FOUND;
	}

	@Override
	public int end(int start) {
		if (start < 0) {
			return -1;
		}
		return start + strToFind.length();
	}
}