Retrieve the match text (提取获取的字符)

需求：

获取字符串Do you like 12 or 34?中的12

方法：

1. Python

a. Global function

import re

match = re.search(r"\d+", subject)

if match:

result = match.group()

else:

result = ""

b. Compiled object

import re

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

match = reobj.search(subject)

if match:

result = match.group()

else:

result = ""

2. Tcl

regexp -linestop {\d+} $subject result