return appendFileterPath(buf, escape(s));
    }

    /**
     * Escapes special regex characters in a string to create a literal pattern.
     * Handles anchor characters (^ and $) specially to preserve their regex meaning.
     *
     * @param s the string to escape
     * @return an escaped regex pattern, or empty string for comments
     */
    protected String escape(final String s) {

                                <la:form action="/admin/pathmap/">
                                    <div class="form-group row">
                                        <label for="regex" class="col-sm-2 text-sm-right col-form-label"><la:message
                                                key="labels.regex"/></label>

Function&&ke.attributeCheck(t,e));else if(!Re[t]||ve[t]){if(!(Ot(e)&&(Ce.tagNameCheck instanceof RegExp&&b(Ce.tagNameCheck,e)||Ce.tagNameCheck instanceof Function&&Ce.tagNameCheck(e))&&(Ce.attributeNameCheck instanceof RegExp&&b(Ce.attributeNameCheck,t)||Ce.attributeNameCheck instanceof Function&&Ce.attributeNameCheck(t,e))||"is"===t&&Ce.allowCustomizedBuiltInElements&&(Ce.tagNameCheck instanceof RegExp&&b(Ce.tagNameCheck,n)||Ce.tagNameCheck instanceof Function&&Ce.tagNameCheck(n))))return!1}else if(Qe[t]);else...

            if (entity.getTerm().startsWith(regexPrefix)) {
                final String regex = entity.getTerm().substring(regexPrefix.length());
                if (StringUtil.isBlank(regex)) {
                    logger.warn("Unknown regex pattern: {}", entity.getTerm());
                } else {
                    pair.getSecond().add(new Pair<>(Pattern.compile(regex), entity.getContent()));
                }
            } else {

    /**
     * Adds custom system properties that match the given regex pattern to the command list.
     *
     * @param cmdList the command list to add properties to
     * @param regex the regular expression pattern to match property names
     */
    protected void addFessCustomSystemProperties(final List<String> cmdList, final String regex) {
        if (StringUtil.isNotBlank(regex)) {
            final Pattern pattern = Pattern.compile(regex);

                                    <tbody>
                                    <tr>
                                        <th style="width: 25%"><la:message key="labels.regex"/></th>
                                        <td>${f:h(regex)}<la:hidden property="regex"/></td>
                                    </tr>
                                    <tr>
                                        <th><la:message key="labels.replacement"/></th>

            false, false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnRegex = cci("regex", "regex", null, null, String.class, "regex", null, false, false, false, "keyword",
            0, 0, null, null, false, null, null, null, null, null, false);

                                                 data-validation="custom"
                                                 data-validation-regexp="(\+|\-)?\d+(\.\d+)?((e|E)(\+|\-)?\d+)?"
                                                 data-validation-help="number (Float)"/>
                                    </div>
                                </div>

 +$/gm,notSpaceStart:/^\S*/,endingNewline:/\n$/,listItemRegex:l=>new RegExp(`^( {0,3}${l})((?:[	 ][^\\n]*)?(?:\\n|$))`),nextBulletRegex:l=>new RegExp(`^ {0,${Math.min(3,l-1)}}(?:[*+-]|\\d{1,9}[.)])((?:[ 	][^\\n]*)?(?:\\n|$))`),hrRegex:l=>new RegExp(`^ {0,${Math.min(3,l-1)}}((?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$)`),fencesBeginRegex:l=>new RegExp(`^ {0,${Math.min(3,l-1)}}(?:\`\`\`|~~~)`),headingBeginRegex:l=>new RegExp(`^ {0,${Math.min(3,l-1)}}#`),htmlBeginRegex:l=>new RegExp(`^ {0,${Mat...

        // Test that MIME type patterns work correctly as regex
        // This verifies the fix for SVG thumbnail generation issue
        // where image/svg+xml was not matching due to unescaped + character

        // SVG MIME type - the + must be escaped in regex
        String svgMimetype = "image/svg+xml";
        String svgPatternWrong = "image/svg+xml"; // Wrong: + means "one or more" in regex