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How preg_match limit number of alphabet to enter

 
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How preg_match limit number of alphabet to enter, alphabet plus numbering
jilong
post 19 Jul, 2007 - 08:34 PM
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I get the ideal to fix the number of numbering to enter with 'preg_match', example the code below will fix the number to enter on the form field to 5 digits.

CODE

if (!post || !preg_match("/^\d{5}$/i",$post)){
        return false;
    }


I would like to implement this ideal to my serial code field, the serial code with start with 1 alphabet and follow with 7 digit (example: A1234567 or B1234567).

Below is the code i try, But it i still could enter more than 1 alphabet than follow with numbering (example: aaaaa777)

Hope some one can correct me.

Thanks

CODE

if (!serial || !preg_match("/^[a-z]+[0-9]\d{1,7}$/i",$serial)){

        return false;
    }
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serializer
post 20 Jul, 2007 - 07:37 AM
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QUOTE(jilong @ 19 Jul, 2007 - 09:34 PM) *

CODE

if (!serial || !preg_match("/^[a-z]+[0-9]\d{1,7}$/i",$serial)){

        return false;
    }



That preg will match 1 OR MORE alpha characters (that's what the + means). To match a single character just remove the +.

I can see a couple other problems; your match goes like this:

- One or more alpha chars: [a-z]+ FOLLOWED BY
- One digit: [0-9] FOLLOWED BY
- BETWEEN 1 and 7 digits inclusive: \d{1,7}

If as I understand you simply want to match an Alpha char followed by exactly 7 digits then you just use:

CODE

"/^[a-z]\d{7}$/i"


--serializer
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Styx
post 24 Jul, 2007 - 10:37 AM
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Try preg_match("/^[a-z][0-9]{7}$/i", $var)
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