RegExp? Quantifier
Definition and Usage
n?contain any string of zero or anquantifiers match.
grammar
new RegExp("n?")
或者更简单方式:
/n?/
或者更简单方式:
/n?/
Browser Support
All major browsers support? Quantifier.
Examples
Examples
To "1" in the global search, including zero or followed immediately by a "0":
var str="1, 100 or 1000?";
var patt1=/10?/g;
var patt1=/10?/g;
The marked text below shows where the expression gets a match:
1 , 10 0 or 10 00?
try it"
JavaSript RegExp objects