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【概要】
PHPには正?表??数群が3??ある。

??正?表??数(POSIX Regex):ereg()系。マルチバイト不可。 PCRE正?表??数(Perl互?):preg_match()系。マルチバイトはUTF-8のみ??。 マルチバイト文字??正?表??数:mb_ereg()系。Rubyの正?表?を使用。PHP5.0で「鬼?」?み?み。

主な特??

PCREはバイナリセ?フで、POSIXはセ?フじゃない。 PCREの正?表?は//などのデリミタで?う必要がある。 Perl互?の正?表??文を使用するpreg_match()のほうが、多くの?合ereg()よりも速く?作するらしい。

EUC-JPを使うのでmb_ereg。
●int mb_ereg ( string $pattern , string $string [, array $regs ] )

マルチバイト文字列に正?表?マッチを行う。 マルチバイト??の正?表?マッチを行い、一致した?合は 1 を返す。オプションの 3 番目の引数を指定した?合は、一致した部分のバイト数を返し、一致した部分文字列が配列 regs に格?される。空文字に一致した?合は 1 を返す。正?表?に一致しないか、エラ?を?生した?合に FALSE を返す。

【正?表?例】
●IP4:xxx.xxx.xxx.xxxの形式チェック
"^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$"
●西?日付:yyyy-mm-ddの形式チェック
"^([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})$"
●URL:有?文字以外をチェック
"[^\-_.!~*\'()a-zA-Z0-9;\/?:\@&=+\$,%#]"
●USERAGENT:有?文字以外をチェック
"[^\-_.!~*\'()a-zA-Z0-9;\/?:\@&=+\$,%#\x20\[\]\{\}]"
●名前:?字チェック(未定?含む全??)
"[\xa1\xa1-\xfe\xfe]"
●名前英?名:有?文字チェック(英文字、ハイフン、ピリオド、半角スペ?ス)
"[a-zA-Z\-.\x20]+"
形式チェックは?しいかも。
●フリガナ:全角カナチェック(全角カナ、?音、全角・半角スペ?ス)
"^[\x20ァ-ヶ?- ]+$"
●Email:PHP系ライブラリの?装(バ?ジョンで?なる可能性あり)

phpspot:シンプル

'/^[a-zA-Z0-9_\.\-]+?@[A-Za-z0-9_\.\-]+$/'

PEAR::Mail_RFC822:オ?バ?ライン文字が入力できませんh

$regex = $strict ? '/^([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i' : '/^([*+!.$|\'\\%\/0-9a-z^_`{}=?(オ?バ?ライン):-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i';

CakePHP:63文字の根?は?

'/\\A(?:^([a-z0-9][a-z0-9_\\-\\.\\+]*)@([a-z0-9][a-z0-9\\.\\-]{0,63}\\.(com|org|net|biz|info|name|net|pro|aero|coop|museum|[a-z]{2,4}))$)\\z/i'

Ethna

'/^([a-z0-9_]|\-|\.|\+)+@(([a-z0-9_]|\-)+\.)+[a-z]{2,6}$/i'


【正?表?注意事?】

perlのサンプルで//?みがあるものは不要なのではずす。 空白文字は\sじゃなくて、\x20。 16?数文字の??(例:\x20\x20)は多バイト符号で表?された1文字と?なされる。 英?名表?はa~z,A~Z,-(ハイフン),.(ピリオド),'(アポ),"(ダブル)が?受けられる。アポとダブルはミドルネ?ムのくくりに使われる。アポは?音?助(オライリ?:O'Reilly)のように使われる。~3世の?述は、IIIとなる。数字0~9は使われない。通常判定は、英文字とハイフン、ピリオド、半角スペ?スでOK。 emailについて emailはコメントネストがあるため正?表?では?述できないらしい。 @より前の部分は、RFCの定?では半角英数?号なんでもありらしい。 日本では、プロバイダが?行するメ?ルアカウントは、半角英数とハイフン、アンダ?バ?、ピリオドのみとするところがほとんどと思われる。(携?含む) WEBメ?ラ?系、特にGmailは、向こうの文化なので、アカウント部分に?号あり。Gmailの独自仕??でアカウント部分の+文字から@までは??らしい。なので?述し放?@@; 最?解は?い。自分のサイト?用に合わせて、チェック仕?(?インジェクション含む)を考える。

【参考URL】
●PHP で使用できる正?表?演算子(mb_ereg)
http://www.kt.rim.or.jp/~kbk/regex/regex.html#PHP
●鬼?正?表?
http://www.geocities.jp/kosako3/oniguruma/doc/RE.ja.txt
●EUC-JP文字コ?ド表
http://charset.7jp.net/euc.html

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