regular expression for validating multiple fixed strings

Question

I currently have a regular expression that allows for the string 'red' in lowercase, uppercase and with spaces surrounding it:

/red/i

How would this regular expression be extended to check for multiple words such as rot, rouge, red and rojo.?

I am using a Javascript plugin which does not support flags. This regex also takes the same form in JavaScript in a none literal format, how would this be extended in the same way?

^\s*[Rr][Ee][Dd]\s*$

Is your question about case sensitivity or multi-language support? — Tim Biegeleisen
– Tim Biegeleisen, Commented Apr 2, 2016 at 11:29
It is about case sensitivity, checking a string that can appear in 4 different ways - then extending a validation regex in a literal and none literal format. — user1554264
– user1554264, Commented Apr 2, 2016 at 11:31

Tim Biegeleisen · Accepted Answer · 2016-04-02 11:02:07Z

1

Try using the OR operator in your regex:

/(blue|green|red)/i

answered Apr 2, 2016 at 11:02

Tim Biegeleisen

526k32 gold badges323 silver badges399 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

user1554264 Over a year ago

Thank you very much - as an extension to my question - I have the same regex in JavaScript ^\s*[Rr][Ee][Dd]\s*$ is there any way to extend this is the same way?

Tim Biegeleisen Over a year ago

Why don't you just use /^\s(red)\s*$/i ?

user1554264 Over a year ago

The string the user enters varies on the language selected. This is the word red. I am using a JavaScript plugin which doesn't support flags. The different versions of this string are rot, rouge, red and rojo.

Tim Biegeleisen Over a year ago

Post the full code relevant to your actual question.

Anton Harald · Accepted Answer · 2016-04-02 11:04:09Z

0

There are many dialect's of regular expressions. However, in this case the following would work in most cases:

/red|green|yellow|blue/i

answered Apr 2, 2016 at 11:04

Anton Harald

6,0145 gold badges32 silver badges71 bronze badges

Collectives™ on Stack Overflow

regular expression for validating multiple fixed strings

2 Answers 2

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related