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) {

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...

ray("amex",g)>-1,d=e&&1===g.length,g.length>0){var h=!1;if(a.each(g,function(d,e){if(e in c){if(b.length>=c[e][0]&&b.length<=c[e][1])return h=!0,!1}else a.formUtils.warn('Use of unknown credit card "'+e+'"',!0)}),!h)return!1}if(""!==b.replace(new RegExp("[0-9]","g"),""))return!1;var i=0;return a.each(b.split("").reverse(),function(a,b){b=parseInt(b,10),a%2===0?i+=b:(b*=2,i+=b<10?b:b-9)}),i%10===0},errorMessage:"",errorMessageKey:"badCreditCard"}),a.formUtils.addValidator({name:"cvv",validatorFun...

    /**
     * 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);

            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);

        regQ(wildcardQuery);
        return wildcardQuery;
    }

    protected RegexpQueryBuilder regRegexpQ(String name, String regexp) {
        checkEsInvalidQuery(name, regexp);
        RegexpQueryBuilder regexpQuery = QueryBuilders.regexpQuery(name, regexp);
        regQ(regexpQuery);
        return regexpQuery;
    }

    protected CommonTermsQueryBuilder regCommonTermsQ(String name, Object text) {

                                                 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

        assertEquals(0, results.length);
    }

    @Test
    public void test_load_invalidRegex() {
        List<RelatedContent> testData = new ArrayList<>();
        testData.add(createRelatedContent("regex:", "Invalid Regex", ""));
        mockBhv.setTestData(testData);

        // Should not throw exception, just log warning
        relatedContentHelper.load();