On Thu, March 1, 2007 6:14 pm, Myron Turner wrote:
> Roberto Mansfield wrote:
>> Myron Turner wrote:
>>
>>> M.Sokolewicz wrote:
>>>
>>>>>> $pattern = '^[a-z0-9\!\_ \.- ,/]*$';
>>>>>> if(!eregi($pattern, $input)){
>>>>>>
>>> the problem is that the hyphen is interpreted as regex range
>>> operator:
>>> [a-z0-9\!\_ \.- ,/]
>>> Rewrite this as
>>> [a-z0-9\!\_ \. ,/-]
>>> with the hyphen in the last position.
>>>
>>>
>>
>> Or just escape the hyphen: \-
>> The position won't matter.
>>
>>
>
> Actually, I tried that, but it didn't work. It still saw the hyphen
> as
> an operator. The other thing about this is that the hyphen is
> followed
> by a space, so that it's asking for a range between the period and the
> space, which you can't do, since the space character has a lower ascii
> value than than the period. The space is more obvious in a monospaced
> font.
The reason that a single \ in front didn't work is that \ is ALSO
special character for ' in PHP, and it just escapes the - so that you
have NOT sent \- to EREG, but sent it the same thing you were sending
it before you added \
You would need \\ inside of '' (or "") in PHP to get a single \ sent
to EREG which would then be used by EREG to escape the -
'...\\- ,/'
PHP takes \\- to produce \- which EREG takes to produce [character -]
instead of [range operator -]
You should probably review the "strings" page at the beginning of the
PHP manual.
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