允许字母字符，空格，破折号，撇号和长度<= 50

Question

I'm trying to write regular expression that allows alpha characters, space, dash, apostrophe and length 50. So far I have this:

/^([A-Za-z\s].{1,50})$/

I'm not sure where I should place the code for dash and apostrophe. If anyone can help pleases let me know. Thanks.

Answer 1

You need

/^[A-Za-z '-]{1,50}$/

or

/^[A-Za-z\s'-]{1,50}$/

When you use \\s instead of a space, you will allow any whitespace.

The apostrophe can be placed anywhere inside the character class (so as not to ruin the ranges), and the hyphen at the start/end of the character class does not need to be escaped.

If you use {1,50} limiting quantifier , it means you allow 1 to 50 chars of the type specified in the character class. If you allow exactly 50 chars, use /^[A-Za-z\\s'-]{50}$/ . If you use just + instead, you will allow 1 or more characters.