java [Java] esacpe正则表达式特殊字符#tags：regex，string，char

Posted 2021-05-08

public String escape(String valueToEscape) {
        StringBuilder sb = new StringBuilder();
        String specialCharactersOfRegex = ".\\+*?[^]$(){}=!<>|:-";

        for (int i = 0; i < valueToEscape.length(); i++) {
            // get character one by one                                                                        
            char currentChar = valueToEscape.charAt(i);
            // does current character include in special characters list ?                                                     
            if (specialCharactersOfRegex.indexOf(currentChar) != -1) {
                sb.append("\\" + currentChar);
            }
            else {
                sb.append(currentChar);
            }
        }
        return sb.toString();
    }