概要
パターンの設定回数について
構文
波括弧{}に数値を指定することで直前のパターンに対して
指定した回数の繰り返しを設定することが可能です。
{x}|直前のパターンをx回繰り返し
{x,}|直前のパターンをx回以上繰り返し
{x,y}|直前のパターンをx回以上y回以下繰り返し
{x,}?|?をつけると最短
例
<html> <head> <script language="javascript"> function executeRegExp(target,pattern) { regExp = new RegExp(pattern); document.write('input:target=' + target + ',pattern=' + pattern + '<br />'); if (target.match(regExp)) { document.write('<div style="color:green;">match as ' + target.match(regExp) + '</div>'); } else { document.write('<div style="color:red;">unmatch</div>'); } document.write('<br />'); } function execLoad() { pattern = '(test){2}'; executeRegExp('testtes',pattern); executeRegExp('testtest',pattern); executeRegExp('testtesttest',pattern); pattern = '(test){2,}'; executeRegExp('testtes',pattern); executeRegExp('testtest',pattern); executeRegExp('testtesttes',pattern); executeRegExp('testtesttest',pattern); pattern = '(test){2,3}'; executeRegExp('testtes',pattern); executeRegExp('testtest',pattern); executeRegExp('testtesttes',pattern); executeRegExp('testtesttest',pattern); executeRegExp('testtesttesttest',pattern); pattern = '(test){2,}?'; executeRegExp('testtes',pattern); executeRegExp('testtest',pattern); executeRegExp('testtesttes',pattern); executeRegExp('testtesttest',pattern); } </script> </head> <body onload="execLoad()"> </body> </html>
結果
input:target=testtes,pattern=(test){2}
unmatch
input:target=testtest,pattern=(test){2}
match as testtest,test
input:target=testtesttest,pattern=(test){2}
match as testtest,test
input:target=testtes,pattern=(test){2,}
unmatch
input:target=testtest,pattern=(test){2,}
match as testtest,test
input:target=testtesttes,pattern=(test){2,}
match as testtest,test
input:target=testtesttest,pattern=(test){2,}
match as testtesttest,test
input:target=testtes,pattern=(test){2,3}
unmatch
input:target=testtest,pattern=(test){2,3}
match as testtest,test
input:target=testtesttes,pattern=(test){2,3}
match as testtest,test
input:target=testtesttest,pattern=(test){2,3}
match as testtesttest,test
input:target=testtesttesttest,pattern=(test){2,3}
match as testtesttest,test
input:target=testtes,pattern=(test){2,}?
unmatch
input:target=testtest,pattern=(test){2,}?
match as testtest,test
input:target=testtesttes,pattern=(test){2,}?
match as testtest,test
input:target=testtesttest,pattern=(test){2,}?
match as testtest,test
