Replace all Matches (替换所有匹配)

需求：

a. 将before and before and before变成afterand after and after(替换所有的before为after)

b. 将before and before and before变成afterand after and before (替换前两个before为after)

方法：

1. Python

a.

import re

subject = "before and before and before"

reobj = re.compile('before')

result = reobj.sub("after",subject)

print result

b.

import re

subject = "before and before and before"

reobj = re.compile('before')

result = reobj.sub("after",subject,2)

print result

2. Tcl

a.

set subject"before and before and before"

regsub -all "before" $subject "after" result

puts "$result"

b.

set subject"before and before and before"

regsub "before" $subject "after" result

for {set i 0} {$i < [expr 2 - 1]} {incr i} {

regsub "before" $result "after" result

}

puts "$result"

（编辑：李大同）

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