.String and regular expression operations

var str='abcdef';
alert((2, 5)); //Cde does not include the end positionalert((1));//bcdef1

var str='a*b*cd*ef';
alert(('*'));//Split characters1

var str='acef'; 
alert((‘a'));//0 Find character positionalert((‘f'));//3 
 alert((‘ce'));//1 
 alert((‘o'));//-1Match failure-1

var re=new RegExp('b', 'i'); //i does not consider upper and lower case//or var re=/b/i;var str='abcdef';//Swap b to B with the same result, if i is removed, it will not workalert((re));

var str='asdf 34 656 cvs33';
var re=/\d/g;
alert((re));//3,4,6,5,6,3,3match Get matching item 1var str='asdf 34 656 cvs33';
var re=/\d+/g;//Global Match: g—g—global,+ means once or more timesalert((re));//34，656，33

var str='asdf 34 656 cvs33';
var re=/\d+/g;
var re2=/\d/g;
alert((re,'*'));//asdf * * cvs*；
alert((re2,'*'));//asdf ** *** cvs**1

var str='A villager in Henan Kaifeng haha'
  var re=/Henan|Kaifeng/g;//Remove sensitive words Henan or Kaifeng  var re1=/Henan|Kaifeng/;
  alert((re,'*'));
  alert((re1,'*'))//没有去掉Kaifeng，Try the results yourself1