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package org.dromara.common.core.utils;
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import cn.hutool.core.convert.Convert;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class ReUtil {
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public final static Pattern GROUP_VAR = Pattern.compile("\\$(\\d+)");
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/**
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* 正则中需要被转义的关键字
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*/
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public final static Set<Character> RE_KEYS = new HashSet<>(
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Arrays.asList('$', '(', ')', '*', '+', '.', '[', ']', '?', '\\', '^', '{', '}', '|'));
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;
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/**
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* 正则替换指定值<br>
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* 通过正则查找到字符串，然后把匹配到的字符串加入到replacementTemplate中，$1表示分组1的字符串
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*
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* <p>
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* 例如：原字符串是：中文1234，我想把1234换成(1234)，则可以：
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*
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* <pre>
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* ReUtil.replaceAll("中文1234", "(\\d+)", "($1)"))
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*
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* 结果：中文(1234)
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* </pre>
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*
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* @param content 文本
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* @param regex 正则
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* @param replacementTemplate 替换的文本模板，可以使用$1类似的变量提取正则匹配出的内容
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* @return 处理后的文本
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*/
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public static String replaceAll(CharSequence content, String regex, String replacementTemplate) {
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final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
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return replaceAll(content, pattern, replacementTemplate);
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}
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/**
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* 正则替换指定值<br>
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* 通过正则查找到字符串，然后把匹配到的字符串加入到replacementTemplate中，$1表示分组1的字符串
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*
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* @param content 文本
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* @param pattern {@link Pattern}
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* @param replacementTemplate 替换的文本模板，可以使用$1类似的变量提取正则匹配出的内容
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* @return 处理后的文本
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* @since 3.0.4
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*/
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public static String replaceAll(CharSequence content, Pattern pattern, String replacementTemplate) {
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if (StringUtils.isEmpty(content)) {
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return StringUtils.EMPTY;
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}
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final Matcher matcher = pattern.matcher(content);
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boolean result = matcher.find();
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if (result) {
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final Set<String> varNums = findAll(GROUP_VAR, replacementTemplate, 1, new HashSet<>());
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final StringBuffer sb = new StringBuffer();
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do {
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String replacement = replacementTemplate;
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for (String var : varNums) {
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int group = Integer.parseInt(var);
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replacement = replacement.replace("$" + var, matcher.group(group));
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}
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matcher.appendReplacement(sb, escape(replacement));
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result = matcher.find();
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}
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while (result);
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matcher.appendTail(sb);
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return sb.toString();
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}
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return Convert.toStr(content);
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}
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/**
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* 取得内容中匹配的所有结果
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*
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* @param <T> 集合类型
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* @param pattern 编译后的正则模式
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* @param content 被查找的内容
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* @param group 正则的分组
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* @param collection 返回的集合类型
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* @return 结果集
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*/
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public static <T extends Collection<String>> T findAll(Pattern pattern, CharSequence content, int group,
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T collection) {
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if (null == pattern || null == content) {
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return null;
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}
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if (null == collection) {
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throw new NullPointerException("Null collection param provided!");
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}
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final Matcher matcher = pattern.matcher(content);
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while (matcher.find()) {
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collection.add(matcher.group(group));
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}
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return collection;
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}
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/**
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* 转义字符，将正则的关键字转义
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*
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* @param c 字符
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* @return 转义后的文本
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*/
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public static String escape(char c) {
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final StringBuilder builder = new StringBuilder();
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if (RE_KEYS.contains(c)) {
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builder.append('\\');
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}
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builder.append(c);
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return builder.toString();
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}
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/**
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* 转义字符串，将正则的关键字转义
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*
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* @param content 文本
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* @return 转义后的文本
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*/
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public static String escape(CharSequence content) {
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if (StringUtils.isBlank(content)) {
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return StringUtils.EMPTY;
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}
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final StringBuilder builder = new StringBuilder();
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int len = content.length();
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char current;
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for (int i = 0; i < len; i++) {
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current = content.charAt(i);
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if (RE_KEYS.contains(current)) {
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builder.append('\\');
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}
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builder.append(current);
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}
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return builder.toString();
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}
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}
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疯狂的狮子Li
1 year ago