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Ê×ÏÈ£¬ÈÃÎÒÃÇ¿´¿´Á½¸oÌرðµÄ×Öu£º'^' ºÍ ¡®$' ËuÃÇÊÇÖ±ðÓÃÀ´Æ¥Åa×Öu´®µÄ¿ªÊ¼ºÍ½aÊø£¬Ò»ÏÂÖ±ð¾ÙÀý˵Ã÷£º

"^The": Æ¥ÅaÒÔ "The"¿ªÍµÄ×Öu´®;

"of despair$": Æ¥ÅaÒÔ "of despair" ½aβµÄ×Ö*u´®;

"^abc$": Æ¥ÅaÒÔabc¿ªÍºÍÒÔabc½aβµÄ×Öu´®£¬Êµ¼ÊÉÏÊÇÖ»ÓÐabcÓe֮ƥÅa£»

"notice": Æ¥Åa°uº¬noticeµÄ×Ö*u´®£»

Äa¿ÉÒÔ¿´¼uÈç¹uÄaûÓÐÓÃÎÒÃÇÌaµ½µÄÁ½¸o×Öu£¨×iºoÒ»¸oÀý×Ó£(C)£¬¾ÍÊÇ˵ ģʽ£¨ÕýÔo±i´iʽ£(C) ¿ÉÒÔ³oÏÖÔÚ±»¼iÑe×Öu´®µÄÈκεØ*½£¬ÄaûÓаÑËuËø¶¨µ½Á½±ß¡£

ÕaÀi»¹Óм¸¸o×Öu '', '+',ºÍ '?', ËuÃÇÓÃÀ´±iʾһ¸o×Öu¿ÉÒÔ³oÏֵĴÎÊý»oÕß˳Ðo. ËuÃÇÖ±ð±iʾ£º"zero or more", "one or more", and "zero or one." ÕaÀiÊÇÒ»Ð(C)Àý×Ó:

"ab": Æ¥Åa×Öu´®aºÍ0¸o»oÕ߸u¶ab×e³ÉµÄ×Ö*u´®("a", "ab", "abbb", etc.);

"ab+": ºÍÉÏÃaeÒ»Ñu£¬µ«×iÉÙÓÐÒ»¸ob ("ab", "abbb", etc.);

"ab?":Æ¥Åa0¸o»oÕßÒ»¸ob;

"a?b+$": Æ¥ÅaÒÔÒ»¸o»oÕß0¸oaÔÙ¼ÓÉÏÒ»¸oÒÔÉϵÄb½aβµÄ×Ö*u´®.

ÄaÒ²¿ÉÒÔÔÚ´oÀ¨ºÅÀiÃaeÏÞÖÆ×Ö*u³oÏֵĸoÊý£¬±ÈÈç

"ab{2}": Æ¥ÅaÒ»¸oaºoÃae¸uÁ½¸ob£¨Ò»¸oÒ²²»ÄÜÉÙ£(C)("abb");

"ab{2,}": ×iÉÙ¸uÁ½¸ob("abb", "abbbb", etc.);

"ab{3,5}": 2£­5¸ob("abbb", "abbbb", or "abbbbb").

Äa»¹Òª×¢Òaµ½Äa±ØÐe×ÜÊÇÖ¸¶¨ (i.e, "{0,2}", not "{,2}").ͬÑu£¬Äa±ØÐe×¢Òaµ½, '', '+', ºÍ'?' Ö±ðºÍÒ»ÏÂÈý¸o*¶Î§±e×¢ÊÇÒ»ÑuµÄ£¬"{0,}", "{1,}", ºÍ "{0,1}"¡£

ÏÖÔÚ°ÑÒ»¶¨ÊýÁ¿µÄ×Öuŵ½Ð¡À¨ºÅÀi£¬±ÈÈ磺

"a(bc)*": Æ¥Åa a ºoÃae¸u0¸o»oÕßÒ»¸o"bc";

"a(bc){1,5}": Ò»¸oµ½5¸o "bc."

»¹ÓÐÒ»¸o×Ö*u '(C)¦', Ïaµ±ÓÚOR ²Ù×÷:

"hi(C)¦hello": Æ¥Åaº¬ÓÐ"hi" »oÕß "hello" µÄ ×Ö*u´®;

"(b(C)¦cd)ef": Æ¥Åaº¬ÓÐ "bef" »oÕß "cdef"µÄ×Ö*u´®;

"(a(C)¦b)c": Æ¥Åaº¬ÓÐÕaÑu - ¶a¸o£¨°uÀ¨0¸o£(C)a»ob£¬ºoÃae¸uÒ»¸ocµÄ×Öu´® µÄ×Ö*u´®;

Ò»¸oµa('.')¿ÉÒÔ´u±iËuÓÐµÄ µ¥Ò»×Ö*u:

"a.[0-9]": Ò»¸oa¸uÒ»¸o×ÖuÔÙ¸uÒ»¸oÊý×ÖµÄ £¨º¬ÓÐÕaÑuÒ»¸o×Öu´®µÄ×Ö*u´®½«±»Æ¥Åa£¬ÒÔºoÊ¡ÂÔ´ËÀ¨ºÅ£(C)

"^.{3}$": ÒÔÈý¸o×Öu½aβ.ÖÐÀ¨ºÅÀ¨×¡µÄÄÚÈÝֻƥÅaÒ»¸o µ¥Ò»µÄ×Öu

"[ab]": Æ¥Åaµ¥¸oµÄ a »oÕß b ( ºÍ "a(C)¦b" Ò»Ñu);

"[a-d]": Æ¥Åa'a' µ½'d'µÄµ¥¸o×Ö*u (ºÍ"a(C)¦b(C)¦c(C)¦d" »¹ÓÐ "[abcd]"Ч¹uÒ»Ñu);

"^[a-zA-Z]": Æ¥ÅaÒÔ×Öĸ¿ªÍµÄ×Öu´®

"[0-9]%": Æ¥Åaº¬ÓÐ ÐÎÈç x£¥ µÄ×Ö*u´®

",[a-zA-Z0-9]$": Æ¥ÅaÒÔ¶ººÅÔÚ¼ÓÒ»¸oÊý×Ö»o×Öĸ½aβµÄ×Ö*u´®

ÄaÒ²¿ÉÒÔ°ÑÄa²»ÏeÒªµÃ×ÖuÁÐÔÚÖÐÀ¨ºÅÀi£¬ÄaÖ»ÐeÒªÔÚ×ÜÀ¨ºÅÀiÃaeʹÓÃ'^' ×÷Ϊ¿ªÍ (i.e., "%[^a-zA-Z]%" Æ¥Åaº¬ÓÐ Á½¸o°ÙÖºÅÀiÃaeÓÐÒ»¸oÇ×Öĸ µÄ×Ö*u´®).

ΪÁËÄܹ»½aÊÍ£¬µ«"^.[$()(C)¦+?{"×÷ΪÓÐÌØÊaÒaÒaµÄ×ÖuµÄʱºo£¬Äa±ØÐeÔÚÕaÐ(C)×Ö *uÃaeÇ°¼Ó'', »¹ÓÐÔÚphp3ÖÐÄaÓ¦¸Ã±ÜÃaÔÚģʽµÄ×iÇ°ÃaeʹÓÃ, ±ÈÈç˵,ÕýÔo±i´iʽ "($(C)¦?[0-9]+" Ó¦¸ÃÕaÑuµ÷Óà ereg("($(C)¦?[0-9]+", $str) (²»ÖªµÀphp4ÊDz»ÊÇÒ»Ñu)

²»ÒªÍu¼ÇÔÚÖÐÀ¨ºÅÀiÃaeµÄ×ÖuÊÇÕaÌo¹aeµÄÀýÍa¡ªÔÚÖÐÀ¨ºÅÀiÃae, ËuÓеÄÌØÊa×Öu£¬°uÀ¨(''), ¶¼½«Ê§È¥ËuÃǵÄÌØÊaÐÔÖÊ(i.e., "[+?{}.]"Æ¥Åaº¬ÓÐÕaÐ(C)×ÖuµÄ×Öu´®). »¹ÓÐ,ÕýÈçregxµÄÊÖ²a¸aeËßÎÒÃÇ: "Èç¹uÁбiÀiº¬ÓÐ ']', ×iºÃ°ÑËu×÷ΪÁбiÀiµÄµÚÒ»¸o×Öu(¿ÉÄܸuÔÚ'^'ºoÃae). Èç¹uº¬ÓÐ'-', ×iºÃ°ÑËuÅÔÚ×iÇ°Ãae»oÕß×iºoÃae, or »oÕßÒ»¸o*¶Î§µÄµÚ¶þ¸o½aÊøµa(i.e. [a-d-0-9]ÖмaµÄ¡®-'½«ÓÐЧ.

ΪÁËÍeÕu, ÎÒÓ¦¸ÃÉae¼°µ½ collating sequences, character classes, ͬÂñ equivalence classes. µ«ÎÒÔÚÕaÐ(C)*½Ãae²»Ïe½²µÄÌ«Ïeϸ, ÕaÐ(C)ÔÚÏÂÃaeµÄÎÄÕÂÖÙ¶¼²»ÐeÒªÉae¼°µ½. ÄaÃÇ¿ÉÒÔÔÚregex man pages ÄÇÀiµÃµ½¸u¶aÏuÏ¢.

ÈçºÎ¹¹½¨Ò»¸oģʽÀ´Æ¥Åa »o±ÒÊýÁ¿ µÄÊaÈe

ºÃÁË£¬ÏÖÔÚÎÒÃÇÒªÓÃÎÒÃÇËuѧµÄÀ´¸ÉÒ»Ð(C)ÓÐÓõÄÊ£º¹¹½¨Ò»¸oÆ¥Åaģʽȥ¼i²eÊaÈeµÄÐÅÏ¢ÊÇñΪһ ¸o±iʾmoneyµÄÊý×Ö¡£ÎÒÃÇÈÏΪһ¸o±iʾmoneyµÄÊýÁ¿ÓÐËÄÖֽʽ£º "10000.00" ºÍ "10,000.00",»oÕßûÓÐСÊý²¿*Ö, "10000" and "10,000". ÏÖÔÚÈÃÎÒÃÇ¿ªÊ¼¹¹½¨Õa¸oÆ¥Åaģʽ:

^[1-9][0-9]*$

ÕaÊÇËu±aÁ¿±ØÐeÒÔÇ0µÄÊý×Ö¿ªÍ.µ«ÕaÒ²Òaζ×Å µ¥Ò»µÄ "0" Ò²²»ÄÜͨ¹ý²aÊÔ. ÒÔÏÂÊǽa¾oµÄ½¨:

^(0(C)¦[1-9][0-9]*)$

"Ö»ÓÐ0ºÍ²»ÒÔ0¿ªÍ*µÄÊý×ÖÓe֮ƥÅa"£¬ÎÒÃÇÒ²¿ÉÒÔÔÊÐiÒ»¸o¸ººÅÔÙÊý×Ö֮ǰ:

^(0(C)¦-?[1-9][0-9]*)$

Õa¾ÍÊÇ: "0 »oÕß Ò»¸oÒÔ0¿ªÍ¿ÉÄÜÓÐÒ»¸o¸ººÅÔÚÇ°ÃaeµÄÊý×Ö." ºÃÁË, ºÃÁËÏÖÔÚÈÃÎÒÃDZðÄÇôÑϽ÷£¬ÔÊÐiÒÔ0¿ªÍ.ÏÖÔÚÈÃÎÒÃÇÅÆu ¸ººÅ , ÒoΪÎÒÃÇÔÚ±iʾǮ±ÒµÄʱºo²¢²»ÐeÒªÓõ½. ÎÒÃÇÏÖÔÚÖ¸¶¨ ģʽ ÓÃÀ´Æ¥ÅaСÊý²¿Ö:

^[0-9]+(.[0-9]+)?$

Õa°µÊ¾Æ¥ÅaµÄ×Öu´®±ØÐe×iÉÙÒÔÒ»¸o°¢À­²®Êý×Ö¿ªÍ. µ«ÊÇ×¢Òa£¬ÔÚÉÏÃaeģʽÖÐ "10." ÊDz»Æ¥ÅaµÄ, Ö»ÓÐ "10" ºÍ "10.2" ²Å¿ÉÒÔ. £¨ÄaÖªµÀΪʲôÂð£(C)

^[0-9]+(.[0-9]{2})?$

ÎÒÃÇÉÏÃaeÖ¸¶¨Ð¡ÊýµaºoÃae±ØÐeÓÐÁ½Î»Ð¡Êý.Èç¹uÄaÈÏΪÕaÑuÌ«¿Á¿Ì,Äa¿ÉÒԸijÉ:

^[0-9]+(.[0-9]{1,2})?$

Õa½«ÔÊÐiСÊýµaºoÃaeÓÐÒ»µ½Á½¸o×Ö*u. ÏÖÔÚÎÒÃǼÓÉÏÓÃÀ´Ôo¼Ó¿É¶ÁÐԵĶººÅ£¨Ã¿¸oÈýλ£(C), ÎÒÃÇ¿ÉÒÔÕaÑu±iʾ:

^[0-9]{1,3}(,[0-9]{3})*(.[0-9]{1,2})?$

²»ÒªÍu¼Ç¼ÓºÅ '+' ¿ÉÒÔ±»³ËºÅ '' Ìae´uÈç¹uÄaÏeÔÊÐi¿Õ°××Öu´®±»ÊaÈe»° (Ϊʲô?). Ò²²»ÒªÍu¼Ç´Ð±¸Ë '' ÔÚphp×Öu´®ÖпÉÄÜ»a³oÏÖ´iÎo (ºÜÆÕ±eµÄ´iÎo). ÏÖÔÚ£¬ÎÒÃÇÒѾ­¿ÉÒÔÈÈÏ×Öu´®ÁË, ÎÒÃÇÏÖÔÚ°ÑËuÓжººÅ¶¼È¥µo str_replace(",", "", $money) È»ºoÔÚ°ÑÀaÐÍ¿´³É doubleÈ»ºoÎÒÃǾͿÉÒÔͨ¹ýËu×oÊýѧ¼ÆËaÁË.

¹¹Ôi¼i²eemailµÄÕýÔo±i´iʽ

ÈÃÎÒÃǼÌÐøÌÖÂÛÔoôÑeÖ¤Ò»¸oemailµØÖ. ÔÚÒ»¸oÍeÕuµÄemailµØÖÖÐÓÐÈý¸o²¿Ö: POP3 Óû§Ãu (ÔÚ '@' ×o±ßµÄÒ»ÇÐ), '@', þÎñÆ÷Ãu(¾ÍÊÇÊ£ÏÂÄDz¿Ö). Óû§Ãu¿ÉÒÔº¬ÓдoСд×Öĸ°¢À­²®Êý×Ö,¾aºÅ ('.'), ¼oºÅ('-'), and Ï»®Ïß ('_'). þÎñÆ÷Ãu×ÖÒ²ÊÇ*uºÏÕa¸o¹aeÔo,µ±È»Ï»®Ïß³ýÍa.

ÏÖÔÚ, Óû§ÃuµÄ¿ªÊ¼ºÍ½aÊø¶¼²»ÄÜÊǾaµa. þÎñÆ÷Ò²ÊÇÕaÑu. »¹ÓÐÄa²»ÄÜÓÐÁ½¸oÁ¬ÐøµÄ¾aµaËuÃÇÖ®¼aÖÁÉÙ´aeÔÚÒ»¸o×Öu£¬ºÃÏÖÔÚÎÒÃÇÀ´¿´Ò»ÏÂÔoôΪÓû§Ãuдһ¸oÆ¥Åaģʽ:

^[_a-zA-Z0-9-]+$

ÏÖÔÚ»¹²»ÄÜÔÊÐi¾aºÅµÄ´aeÔÚ. ÎÒÃÇ°ÑËu¼ÓÉÏ:

^[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*$

ÉÏÃaeµÄÒa˼¾ÍÊÇ˵: "ÒÔÖÁÉÙÒ»¸o¹ae¶×Öu£¨³ý.ÒaÍa£(C)¿ªÍ,ºoÃae¸u×Å0¸o»oÕ߶a¸oÒÔµa¿ªÊ¼µÄ×Öu´®."

¼oµ¥»¯Ò»µa, ÎÒÃÇ¿ÉÒÔÓà eregi()È¡´u ereg().eregi()¶Ô´oСд²»Ão¸Ð, ÎÒÃǾͲ»ÐeÒªÖ¸¶¨Á½¸o*¶Î§ "a-z" ºÍ "A-Z" ¨C Ö»ÐeÒªÖ¸¶¨Ò»¸o¾Í¿ÉÒÔÁË:

^[_a-z0-9-]+(.[_a-z0-9-]+)*$

ºoÃaeµÄ*þÎñÆ÷Ãu×ÖÒ²ÊÇÒ»Ñu,µ«ÒªÈ¥µoÏ»®Ïß:

^[a-z0-9-]+(.[a-z0-9-]+)*$

Done. ÏÖÔÚÖ»ÐeÒªÓá±@¡±°ÑÁ½²¿*ÖÁ¬½Ó:

^[_a-z0-9-]+(.[_a-z0-9-]+)@[a-z0-9-]+(.[a-z0-9-]+)$

Õa¾ÍÊÇÍeÕuµÄemailÈÏ֤ƥÅaģʽÁË,Ö»ÐeÒªµ÷ÓÃ

eregi(¡®^[_a-z0-9-]+(.[_a-z0-9-]+)@[a-z0-9-]+(.[a-z0-9-]+)$ ',$eamil)

¾Í¿ÉÒԵõ½ÊÇ*ñΪemailÁË¡£

ÕýÔo±i´iʽµÄÆaËuÓÃ*¨

ÌaÈ¡×Ö*u´®

ereg() and eregi() ÓÐÒ»¸oÌØÐÔÊÇÔÊÐiÓû§Í¨¹ýÕýÔo±i´iʽȥÌaÈ¡×Öu´®µÄÒ»²¿Ö(¾ßÌaÓÃ*¨Äa¿ÉÒÔÔĶÁÊÖ²a). ±ÈÈç˵,ÎÒÃÇÏe´Ó path/URL ÌaÈ¡ÎļþÃu ¨C ÏÂÃaeµÄ´uÂe¾ÍÊÇÄaÐeÒª:

ereg("([^/]*)$", $pathOrUrl, $regs);

echo $regs[1];

¸ß¼¶µÄ´u»»

ereg_replace() ºÍ eregi_replace()Ò²ÊÇ*dz£ÓÐÓõÄ: ¼ÙÈçÎÒÃÇÏe°ÑËuÓеļa¸o¸ººÅ¶¼Ìae»»³É¶ººÅ:

ereg_replace("[ ]+", ",", trim($str));