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Asked: 2026-06-15T17:12:17+00:00

I want to make a regular expression for my university registration number. I am

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I want to make a regular expression for my university registration number. I am 75% successful to make it. I’m new and i don’t know how to make it. This is what i am doing.

<!DOCTYPE html>
<html> 
<body>

<script>
str = "l1s10bscs"; //successfully tested
                   //but i want to append any 4 digits at the end of l1s10bscs

re = /[a-zA-Z]\d{1}[s|S|f|F]\d{2}[bscs]/g;

result = re.test(str);

document.write(result);

</script>

</body>
</html>

i tried this but it doesn’t work.

re = /[a-zA-Z]\d{1}[s|S|f|F]\d{2}[bscs][0-9]{4}/g;  // this doesn't work
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1 Answer

  1. Editorial Team
    /[a-z]\d[sf]\d{2}bscs\d{4}/i

    According to your description, this should fit.

    I changed the following:

    • [bscs] means “b or s or c or s” (so “b or s or c”, the extra s is meaningless). You wanted just the literal four-character string “bscs”
    • \d{1} is the same as \d – this isn’t an error, but there’s no reason to explicity define a character as occurring only once.
    • You have a \g flag but no \i, so you’ll match the string you’re looking for multiple times inside of a larger string, but your search isn’t case insensitive.
    • [s|S|f|F] means “s or | or S or |…” You meant “s or S or f…”, which is written [sSfF].
    • Since \i is used to make a search case insensitive, I simplified [sSfF] to [sf]
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