JS中indexOf()要领可返回某个指定的字符串值在字符串中初次涌现的位置。应用第二个参数,轮回挪用就可以获取到子串涌现的一切位置。
/** * 查询字符串中子字符串涌现位置 * @param str * @param substr * @return {Array} */ function search_substr_pos(str, substr) { var _search_pos = str.indexOf(substr), _arr_positions = []; while (_search_pos > -1) { _arr_positions.push(_search_pos); _search_pos = str.indexOf(substr, _search_pos + 1); } return _arr_positions; } var str = "look at me,is there anything can prove that I am a good guy ?"; var $_pos_substr = search_substr_pos(str, 'e');//子串位置 var $_times_substr = $_pos_substr.length;//涌现次数 console.log($_pos_substr); // [ 9, 16, 18, 37 ] console.log($_times_substr); // 4
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同理,PHP中运用strpos()要领
/** * 查询字符串中子字符串涌现位置 * @param $str * @param $substr * @return array */ function search_substr_pos($str, $substr) { $_search_pos = strpos($str, $substr); $_arr_positions = array(); while ($_search_pos > -1) { $_arr_positions[] = $_search_pos; $_search_pos = strpos($str, $substr, $_search_pos + 1); } return $_arr_positions; } $str = "look at me,is there anything can prove that I am a good guy ?"; $_pos_substr = search_substr_pos($str, 'e');//子串位置 $_times_substr = count($_pos_substr);//涌现次数 print_r($_pos_substr); // Array ( [0] => 9 [1] => 16 [2] => 18 [3] => 37 ) print_r($_times_substr); // 4
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