Re: [PHP-DB] regex question
At 11:04 3/7/2005, Chip Wiegand wrote:
>I am writing some regex on a php form to validate input and have come up
>with this, for example -
>
>if (empty($first) || !eregi("^[A-Za-z]+[- ]?[A-Za-z]+$", $first))
>
>for checking a persons name. This allows a single name, or a hyphenated
>double name, or a non-hyphenated double name, and it works. My question is
>this - why is the third set followed by a '+' optional? I thought the +
>meant the preceding group is present 1 or more times. The ? means the
>preceding group is present 0 or more times. Why is it that when I put a ?
>in the place of the + after the last ]
>
>if (empty($first) || !eregi("^[A-Za-z]+[- ]?[A-Za-z]?$", $first))
>
>the regex is broken?
>
>Regards,
>Chip
If you want to add the capability for those weird, foreign
names [ ;^) ], take a look at the RegEx on this page:
http://www.RegExLib.com/UserPatterns.aspx?authorId=45511
Start Here to Find It Fast! -> http://www.US-Webmasters.com/best-start-page/
$8.77 Domain Names -> http://domains.us-webmasters.com/
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Re: [PHP-DB] regex question
Chip Wiegand wrote:
I am writing some regex on a php form to validate input and have come up
with this, for example -
if (empty($first) || !eregi("^[A-Za-z]+[- ]?[A-Za-z]+$", $first))
for checking a persons name. This allows a single name, or a hyphenated
double name, or a non-hyphenated double name, and it works. My question is
this - why is the third set followed by a '+' optional? I thought the +
meant the preceding group is present 1 or more times. The ? means the
preceding group is present 0 or more times. Why is it that when I put a ?
in the place of the + after the last ]
if (empty($first) || !eregi("^[A-Za-z]+[- ]?[A-Za-z]?$", $first))
the regex is broken?
The ? doesn't mean 0 or more, it means 'optional' - 0 or 1 times.
without specific examples on what works or what breaks, I can't explain
it much better than this - but rest assured, that's your problem.
now I'm sitting here wondering if ?* and ?+ are interchangeable, and
thinking so.
Cheers,
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Outreach x3257
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[PHP-DB] regex question
I am writing some regex on a php form to validate input and have come up
with this, for example -
if (empty($first) || !eregi("^[A-Za-z]+[- ]?[A-Za-z]+$", $first))
for checking a persons name. This allows a single name, or a hyphenated
double name, or a non-hyphenated double name, and it works. My question is
this - why is the third set followed by a '+' optional? I thought the +
meant the preceding group is present 1 or more times. The ? means the
preceding group is present 0 or more times. Why is it that when I put a ?
in the place of the + after the last ]
if (empty($first) || !eregi("^[A-Za-z]+[- ]?[A-Za-z]?$", $first))
the regex is broken?
Regards,
Chip
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