如何在Ruby中的glob模式和regexp模式之间转换? [英] How to convert between a glob pattern and a regexp pattern in Ruby?
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问题描述
Glob模式与正则表达式模式相似,但不相同.给定一个glob字符串,如何将其转换为相应的regexp字符串?
Glob patterns are similar to regexp patterns but not identical. Given a glob string, how to I convert it into the corresponding regexp string?
请参见 Dir#glob 和Perl的 Text-Glob 库和从glob表达式创建正则表达式(适用于python).
See Dir#glob and Perl's Text-Glob library, and Create regex from glob expression (for python).
推荐答案
I've written a partial implementation of this as part of the rerun gem but if anyone knows a better way, I'd love to hear about it. Here's my code (latest code and tests are up on github).
class Glob
NO_LEADING_DOT = '(?=[^\.])' # todo
def initialize glob_string
@glob_string = glob_string
end
def to_regexp_string
chars = @glob_string.split('')
in_curlies = 0;
escaping = false;
chars.map do |char|
if escaping
escaping = false
char
else
case char
when '*'
".*"
when "?"
"."
when "."
"\\."
when "{"
in_curlies += 1
"("
when "}"
if in_curlies > 0
in_curlies -= 1
")"
else
char
end
when ","
if in_curlies > 0
"|"
else
char
end
when "\\"
escaping = true
"\\"
else
char
end
end
end.join
end
end
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