RegEx puzzle - 未名空间MITBBS历史存档

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RegEx puzzle

RegEx puzzle# Programming - 葵花宝典

c*t2007-09-06 07:09

1 楼

$s = '7/1/2007 1:20,field 2,6/9/2006 2:9,field 3,1/1/2008 12:9';
try to convert it to
'07/01/2007 01:20,field 2,06/09/2006 02:09,field 3,01/01/2008 12:09'
how to write reguler expression to replace?
$x =~ s![^01-9]?(\d)([/:]+)!0$1$2!g; # removed , and empty space
~
~

c*t2007-09-06 07:09

2 楼

$x =~ s!([^0-9]?[1-9])([/:,]+)!0$1$2!g; #doesn't work either

【在 c**t 的大作中提到】

: $s = '7/1/2007 1:20,field 2,6/9/2006 2:9,field 3,1/1/2008 12:9';
: try to convert it to
: '07/01/2007 01:20,field 2,06/09/2006 02:09,field 3,01/01/2008 12:09'
: how to write reguler expression to replace?
: $x =~ s![^01-9]?(\d)([/:]+)!0$1$2!g; # removed , and empty space
: ~
: ~

c*t2007-09-06 07:09

3 楼

thanks, ${1} is the key!!

c*t2007-09-06 07:09

4 楼

maybe using replace multiple times..

c*t2007-09-06 07:09

5 楼

多次替换可以, 一次替换有难度