定制pattern的string模板(template) 详解
string.Template的pattern是一个正则表达式, 可以通过覆盖pattern属性, 定义新的正则表达式.
如: 使用新的定界符"{{", 把{{var}}作为变量语法.
代码:
# -*- coding: utf-8 -*-
'''''
Created on 2014.6.5
@author: Administrator
@edition : python 3.3.0, eclipse pydev
'''
import string
t = string.Template('$var')
print(t.pattern.pattern)
class MyTemplate(string.Template):
delimiter = '{{'
pattern = r'''''
\{\{("htmlcode">
\$(?:
(?P<escaped>\$) | # Escape sequence of two delimiters
(?P<named>[_a-z][_a-z0-9]*) | # delimiter and a Python identifier
{(?P<braced>[_a-z][_a-z0-9]*)} | # delimiter and a braced identifier
(?P<invalid>) # Other ill-formed delimiter exprs
)
MATCHES: [('{{', '', '', ''), ('', 'var', '', '')]
SUBSTITUTED:
{{
replacement
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