使用 python3 re 模块捕获所有函数调用

Question

嗯，我有这个字符串和模式：

s = '''double factorial ( double n ) { if ( n == 0 ) { return 1 ; } if ( n == 1 ) {     return factorial(n - 2 + 1) ; } return n * factorial ( n - 1 ) ; }'''
l = re.findall(r"{ .*(factorial\s*\(.*\))", s)

目的是匹配 all fn 调用，即只是 factorial(args) 部分。我如何修改上面的内容，以便列表 'l' returns 所有相关的匹配项？

('l' 当前是 ['factorial ( n - 1 )']，这只是 findall returns 之后的最后一场比赛 returns)

Answer 1

使用

\bfactorial\s*\([^()]*\)

参见regex proof。

解释

--------------------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
--------------------------------------------------------------------------------
  factorial                'factorial'
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  \(                       '('
--------------------------------------------------------------------------------
  [^()]*                   any character except: '(', ')' (0 or more
                           times (matching the most amount possible))
--------------------------------------------------------------------------------
  \)                       ')'

使用 python3 re 模块捕获所有函数调用

Capture all function calls using the python3 re module

regex

python-3.x

python-re