Question

以S开头，后面3位数字。。js正则怎么写法呢。。

Answer 1

???? 又发一个啊,,
还好 我又上百度找了一下资料 发现了!

<script>

function checkS(s){
var patrn=/^([s][0-9][0-9][0-9]){1,4}$/i;
if (!patrn.exec(s)){
return false
}else{
return true
}
}

document.write(checkS("1345134")+"<br>")
document.write(checkS("gwrg")+"<br>")
document.write(checkS("s133")+"<br>")
document.write(checkS("s12332")+"<br>")
document.write(checkS("Serhqre")+"<br>")
document.write(checkS("s")+"<br>")

</script>

Answer 2

/^S\d{3}$/或/^S[0-9]{3}$/

Answer 3

^S\d{3}$