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  1. #1
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    PHP Regular Expression Question

    Fogive the basic question... this seems like it should be pretty simple but I'm really not sure how to do it.

    I want to test whether a string of characters contains anything other than a-z.

    For example, "ghegrh" or "kdqoek" would pass. "ehr%thq" or "th85.ehr" would fail.

    I would think this could be done with a regular expression but if there's a better way to do it that would be great.

  2. #2
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  3. #3
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    Code:
    						
    eregi('^[a-zA-Z]{10}', $_REQUEST['VAR'])
    That will allow the user to input anything between a-z and A-Z up to 10 letters. The user cannot input a number or 11+ letters. Reg. expressions are probably the best way to do what you want to do

  4. #4
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    Thumbs up

    Thanks guys, that did the trick.

  5. #5
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    Actually, if you allow for both uppercase and lowercase letters, then use ctype_alpha() in the C locale.
    It is faster than regular expressions, which is overkill in this case.
    #include<cstdio>
    char*s="#include<cstdio>%cchar*s=%c%s%c;%cint main(){std::printf(s,10,34,s,34,10);}";
    int main(){std::printf(s,10,34,s,34,10);}

  6. #6
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    I've been fooling around with PHP for years and I didn't even know "ctype" existed. It's exactly what I wanted.

    Just found this: http://us2.php.net/manual/en/ref.ctype.php

  7. #7
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    Originally posted by laserlight
    Actually, if you allow for both uppercase and lowercase letters, then use ctype_alpha() in the C locale.
    It is faster than regular expressions, which is overkill in this case.
    Regular Expressions are more versatile though, don't you think?

  8. #8
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    Regular Expressions are more versatile though, don't you think?
    Of course, hence one should use them as necessary.
    They are not necessary in this case.
    #include<cstdio>
    char*s="#include<cstdio>%cchar*s=%c%s%c;%cint main(){std::printf(s,10,34,s,34,10);}";
    int main(){std::printf(s,10,34,s,34,10);}

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