需求：

获取字符串Do you like 12 or 34?中的12， 34

方法：

1. Python

a. Global function

import re

subject = "Do you like 12 or 34?"

result = re.findall(r"\d+",subject)

b. Compiled object

import re

reobj = re.compile(r"\d+")

2. Tcl

set subject "Do you like 12 or 34?"

set result ""

set pos 0

while {[regexp -indices -start $pos -linestop {\d+} $subject offsets]==1} { set pos [expr {1+[lindex $offsets 1]}] lappend result [string range $subject [lindex $offsets 0] [lindex $offsets 1]] }