var reg = /^Chapter [1-9][0-9]{0,1}/,
str1 = 'Chapter 29 ',
str2 = 'this is Chapter 29';
document.write('/^Chapter [1-9][0-9]{0,1}/.test(\'Chapter 29 \'): ' + reg.test(str1) + '<br>');
document.write('/^Chapter [1-9][0-9]{0,1}/.test(\'this is Chapter 29\'): ' + reg.test(str2));