請教一個正則匹配的問題

zjpixyniannian

我有個字符串，比如 createby=root and date=20121115 and type=insert
但是這個and的數(shù)量不定，也就是說有可能只有一個 createby=root, 也可能有多個被and 連接。

如果用split的話，我可以把這個字符串用空格分割開來，然后分別處理，如果用正則的話，該如何處理呢？

$str =~ /^((\w+)=(\w+)\S+))$/ ;

這樣可以么？但是這種括號套括號的情況，我就不不知道該怎么處理這種捕獲了。。而且，最外層括號最后捕獲的數(shù)量該怎么獲得呢？？


求教了。。。。

kk861123

貌似沒有說清楚你想捕捉什么？看著有點亂

jason680

回復 1# zjpixyniannian

How about this to get the item and value

$ cat get_item_value.pl

use strict;
use warnings;

$_ = 'createby=root and date=20121115 and type=insert';

my $sCnt = 0;
print "string= '$_'\n";
while(m/(\S+)=(\S+)/g){
  $sCnt++;
  my ($sItem, $sValue) = ($1, $2);
  print "cnt=$sCnt, item=$sItem, value=$sValue\n";
}


$ perl get_item_value.pl
string= 'createby=root and date=20121115 and type=insert'
cnt=1, item=createby, value=root
cnt=2, item=date, value=20121115
cnt=3, item=type, value=insert


   

mcshell

1. $_ = 'createby=root and date=20121115 and type=insert' ;
   
2.    1 while(m/(\S+)=(\S+)(?{print "$1,$2\n"})/g)

復制代碼

利用m//g,perlre:
Similarly, for repeated m/()/g the second-best match is the match at the position one notch further in the string.
The additional state of being matched with zero-length is associated with the matched string, and is reset by each assignment to pos(). Zero-length matches at the end of the previous match are ignored during split.