Dart 字符串

定义+拼接

单引号或者双引号的创建与拼接

String a = 'abc';
String b = "abc";
//相邻字符串创建
var c = 'hello' + ' ' + 'world';
var b = 'hello'' ''world';
var d = 'hello'   ' '     'world';

var e = 'hello'
' '
'world';

var f = '''
hello world
this is multi line
''';

var g = """
hello world
this is multi line
""";

var h = 'hello'',world'",OK";

转义字符

var s1 = 'In a raw string, not even \n gets \t special treatment.';
print(s1);
//结果
In a raw string, not even 
 gets    special treatment.

加r，可以识别转义字符

var s = r'In a raw string, not even \n gets \t special treatment.';
  print(s);

In a raw string, not even \n gets \t special treatment.

搜索

var a = 'hello world';
print(a.contains('wo'));    //true
print(a.startsWith('h'));    //true    
print(a.endsWith('d'));    //true
print(a.indexOf('llo'));    //2

提取数据

var a = 'hello world';
var b = a.split(' ');

大小写转换

print(a.toLowerCase());
print(a.toUpperCase());

替换

print('hello world world!'.replaceAll('world', 'abc'));