Matching module code using regex [duplicate]

Question

I have never worked with RegEx and have been trying to perform validation to ensure a module code matches the correct format. A valid module code should be in the form: CSC8001

My code is as follows:

if(moduleCode.matches("^CSC8\d{3}")){ 
        throw new IllegalArgumentException();
    }

This produces an invalid escape sequence error which I have been unable to resolve.

Thanks in advance, Mark.

dryairship · Accepted Answer · 2016-04-12 12:24:44Z

1

You must use:

moduleCode.matches("^CSC8\\d{3}")

\d is an illegal character. To make it \d you must use \\d.

\\ escapes to form a single back slash.

edited Apr 12, 2016 at 12:24

answered Apr 12, 2016 at 12:18

dryairship

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1 Comment

Mark Johnson Over a year ago

Will this correctly catch the module format? Thanks for your help

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