Javascript regular expression single quotes

Question

My Regex is:

var re = /^[a-z A-Z._]{1,15}$/;

I want to allow this: ' (Single Quote).

How can I do this?

Solution 1

You can use the following regex for example to allow a string like abcd'dfgh:

/^[A-Za-z\/\']+[A-Za-z]$/

Solution 2

To allow single quote, add it in the character class like ^[a-z A-Z._']{1,15}$

This regex allows ' matching 'abc'_, a'b'c_ etc.

Comments

[Naveed S]

@mosh In which part do you want to include '? Is it like the sample I gave?

[ZagNut]

downvoted. question is for javascript. you must escape the single quote.

[Aaron]

The regex now accepts slashes, doesn't accept spaces underscores nor dots anymore, doesn't validate that the string is 15 chars at most and now require the string to be 2 chars at least. Also ' won't be matched if it is the last char. Why the hell was this accepted and upvoted to +4?

[Aaron]

@ZagNut that is incorrect. Here's an example of a regex replace where the regex contains unescaped single quotes. Aside from regex meta-characters, in JS only forward slashes need to be delimited if you're using the /pattern/flags construct, or double quotes if you're using the RegExp("pattern", flags) constructor, in both case because they delimit the pattern.

[Aaron]

Err, I should be careful not to make mistakes when correcting others... Since strings can be represented enclosed in single-quotes in JS, you can use new RegExp('pattern', flags) to create regexs, in which case single-quotes should be escaped in the pattern (example). This is to my knowledge the only case where it makes sense to escape single quotes in JS regex.