正则表达式验证 JavaScript 中的 1-5 位字母数字字符串

Question

I need to validate an alphanumeric string where it contains at least 1 digit and at most 5 digits, ie accept characters [a-zA-Z0-9] with the above restriction.

I am working on JavaScript.

Answer 1

You can use /^[a-zA-Z]*([0-9][a-zA-Z]*){1,5}$/ :

 var samples = ['asldi', 's23', '2341123', '221', 'sdf3'] samples.forEach(s => { console.log(s + ": ", /^[a-zA-Z]*([0-9][a-zA-Z]*){1,5}$/.test(s)) } )

with:

• ^[a-zA-Z]* matches possible leading letters;
• ([0-9][a-zA-Z]*){1,5} matches 1 to 5 digits with possible intermediate letters;
• $ matches the end of string;