Python-Custom pattern string template for specific explanations

Custom pattern string Templates (template) for specific explanations

This address: http://blog.csdn.net/caroline_wendy/article/details/28625179

string. Template pattern is a regular form that enables you to define a new regular form by overriding the Pattern property .

For example: Use the new delimiter "{{" and {{var}} as the variable syntax.

Code:

#-*-Coding:utf-8-*-' Created on 2014.6.5@author:administrator@edition:python 3.3.0, Eclipse pydev ' import stringt = String. Template (' $var ') print (T.pattern.pattern) class MyTemplate (string. Template):    delimiter = ' {'    pattern = R ' '    \{\{(?
:      (? p<escaped>\{\{) |   # Escape sequence of 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    )    ' t2 = MyTemplate (' ' {{{{{{{{    }}} ') Print (' MATCHES: ', T2.pattern.findall (t2.template)) print (' substituted: ', T2.safe_substitute (var= ' replacement '))

Output:

    \$(?:      (? p<escaped>\$) |   # Escape sequence of 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

Python-Custom pattern string template for specific explanations