RegExpsticky鈥斺€攜淇グ绗︽鍒欏鐞嗕腑鏂囬棶棰樷€斺€攗淇グ绗﹀瀛楄妭姹夊瓧鍖归厤鐐筩haracternewunicode鐮佺偣鍖归厤姹夊瓧閲忚瘝i淇グ绗﹂瀹氫箟妯″紡ES6-ES10瀛︿範layoutsticky鈥斺€攜淇グ绗琛ㄧず绮樻€э紙sticky锛夛紝鍏ㄥ眬鍖归厤锛屽繀椤讳粠绗竴涓紑濮嬪尮閰嶏紝杩炵画鍖归厤consts='aaa_aa_a'constr1=/a+/g//鐩稿綋浜巀$constr2=/a+/yconsole.log(r1.exec(s))//["aaa",index:0,input:"aaa_aa_a"]//鍖归厤缁撴灉锛屽尮閰嶈捣濮嬬储寮曪紝杈撳叆鍊糲onsole.log(r2.exec(s))//["aaa",index:0,杈撳叆:"aaa_aa_a"]console.log(r1.exec(s))//["aa",index:4,杈撳叆:"aaa_aa_a"]console.log(r2.exec(s))//nullg淇グ绗︿粠涓嬩竴涓猘aa寮€濮嬪尮閰嶏紝寮€澶翠笉鑳芥槸ay淇グ绗︿粠涓嬩竴涓猘aa寮€濮嬪尮閰嶏紝寮€澶村繀椤绘槸a锛屼笉鏄痑杩斿洖null渚嬪瓙锛氫娇鐢╨astIndex灞炴€э紝鍙互鏇村ソ鍦拌В閲妝淇グ绗︺€俢onstREGEX=/a/g//鎸囧畾浠庝綅缃?(y)寮€濮嬪尮閰峈EGEX.lastIndex=2//鍖归厤鎴愬姛constmatch=REGEX.exec('xaya')//鍦ㄤ綅缃?鍖归厤鎴愬姛console.log(match.index)//3//涓嬩竴娆″尮閰嶄粠浣嶇疆4寮€濮媍onsole.log(REGEX.lastIndex)//4//浠庝綅缃?寮€濮嬪尮閰嶅け璐EGEX.exec('xaxa')//null涓婇潰鐨勪唬鐮侊紝lastIndex灞炴€ф寚瀹氭瘡娆℃悳绱㈢殑璧峰浣嶇疆锛実淇グ绗︿粠璇ヤ綅缃悜鍚庢悳绱紝鐩村埌鎵惧埌鍖归厤椤广€倅淇グ绗︿篃閬靛惊lastIndex灞炴€э紝浣嗚姹傚繀椤诲湪lastIndex鎸囧畾鐨勪綅缃壘鍒板尮閰嶉」銆俢onstREGEX=/a/y//鎸囧畾浠庝綅缃?寮€濮嬪尮閰峈EGEXlastIndex=2//涓嶆槸绮樼潃鐨勶紝鍖归厤澶辫触REGEX.exec('xaya')//null//鎸囧畾浠庝綅缃?寮€濮嬪尮閰峈EGEX.lastIndex=3//绗?涓綅缃矘杩烇紝鍖归厤鎴愬姛constmatch=REGEX.exec('xaxa')console.log(match.index)//3console.log(REGEX.lastIndex)//4鍏充簬regular涓枃闂鐨勫鐞嗏€斺€攗淇グ绗︽槸涓€涓瀛楄妭鐨勫瓧绗︼紝鍦╱nicode涓ぇ浜嶾uffff锛屽湪ES5涓病鍔炴硶姝ｇ‘鍖归厤銆備篃灏辨槸璇达紝浣跨敤u淇グ绗﹀彲浠ユ纭鐞嗗洓瀛楄妭鐨刄TF-16缂栫爜銆傪牣稶+20BB7澶氬瓧鑺傛眽瀛楀尮閰峫ets='馉'lets2='\uD842\uDFB7'console.log(/^\uD842/.test(s2))//true鍙尮閰嶄袱涓瓧绗︼紝鏄笉瀵筩onsole.log(/^\uD842/u.test(s2))//falsedotcharacter鐐瑰瓧绗﹁〃绀洪櫎鎹㈣绗﹀鐨勪换浣曞崟涓瓧绗︼紝浣嗗ぇ浜?xFFFF鐨勫崟涓瓧绗︾偣瀛楃涓嶈兘璇嗗埆console.log(/^.$/.test(s))//false鍖归厤浠绘剰瀛楃锛岄敊璇痗onsole.log(/^.$/u.test(s))//true鍖归厤浠绘剰瀛楃锛屽姞涓€涓猽nicode鐮佷綅鍖归厤姹夊瓧.log(/\u{20BB7}/u.test(s))//trueconsole.log(/\u{61}/u.test('a'))//trueconsole.log(/\u{61}/.test('a'))//false閲忚瘝鍙互缁熻//馉{2}琛ㄧず鍑虹幇涓ゆconsole.log(/馉{2}/u.test('馉馉'))//trueconsole.log(/馉{2}/.test('馉馉'))//false鍖归厤涓嶆纭彟澶栵紝鍙湁浣跨敤u淇グ绗︽椂锛孶nicode琛ㄨ揪寮忎腑鐨勮姳鎷彿鎵嶄細琚纭В閲婏紝鍚﹀垯瀹冨皢琚В閲婁负閲忚瘝銆?^\u{3}$/.test('uuu')//true鍦ㄤ笂闈㈢殑浠ｇ爜涓紝鐢变簬姝ｅ垯琛ㄨ揪寮忔病鏈塽淇グ绗︼紝鎵€浠ュぇ鎷彿琚В閲婁负閲忚瘝銆備娇鐢╱淇グ绗︼紝瀹冨皢琚В閲婁负Unicode琛ㄨ揪寮忋€?\u{20BB7}{2}/u.test('馉馉')//浣跨敤u淇グ绗﹀悗涔熷彲浠ヤ娇鐢ㄧ湡姝ｇ殑Unicode琛ㄨ揪寮?閲忚瘝銆俰modifierconsole.log(/[a-z]/iu.test('\u212A'))//trueconsole.log(/[a-z]/i.test('\u212A'))//false灏界i琚拷鐣ュ畠鏄ぇ鍐欐垨灏忓啓锛屼絾浠嶇劧涓嶅尮閰嶉瀹氫箟鐨勬ā寮忋€倁淇グ绗﹁繕浼氬奖鍝嶉瀹氫箟妯″紡锛屾槸鍚﹀彲浠ユ纭瘑鍒唬鐮佺偣澶т簬0xFFFF鐨刄nicode瀛楃銆?^\S$/.test('馉')//false/^\S$/u.test('馉')//true涓婇潰浠ｇ爜涓殑\S鏄瀹氫箟鐨勬ā寮忥紝鍖归厤鎵€鏈夊瓧绗︿笉鏄┖鏍笺€傚彧鏈夊姞涓妘淇グ绗︼紝鎵嶈兘姝ｇ‘鍖归厤鐮佷綅澶т簬0xFFFF鐨刄nicode瀛楃銆備娇鐢ㄥ畠锛屾偍鍙互缂栧啓涓€涓纭繑鍥炲瓧绗︿覆闀垮害鐨勫嚱鏁般€俧unctioncodePointLength(text){constresult=text.match(/[\s\S]/gu);杩斿洖缁撴灉锛焤esult.length:0;}consts='馉馉';console.log(s.length)//4constreals=codePointLength(s)console.log(reals)//2瀛︿範甯冨眬
