python regex命令行工具，用于替换类似于“perl-ne”的功能。
red的Python项目详细描述
python regex命令行工具，用于替换类似于“perl-ne”的功能。
安装
从项目根目录：
$ python setup.py install
用法
使用–help/-h查看有关参数的信息：
$ red --help
可用的特殊变量：
| line: | for the entire line that was matched, without the trailing newline |
|---|---|
| g: | for groups, which you index to get that match group, as g[0] in “(w+) .*” |
| ag: | for aggregated groups with the -a option, which is a list of all match groups |
| d: | for the groupdict, which you can index by named group as d[“foo”] in “(?P<foo>w+) .*” |
| ad: | for the aggregated group dicts, a list of dicts |
示例用法：
$ cat test.txt foo 1 bar 2 fiz 5 baz 10 funk 10 bunk 9 funk a bunk b a b c d aaaaa bbbb cc
像grep一样使用：
$ cat test.txt | red "\w+ (\d+) \w+ (\d+)" foo 1 bar 2 fiz 5 baz 10 funk 10 bunk 9
它也可以使用path作为参数，，但是路径必须直接出现在regex之后（argparse的奇怪之处）。：
$ red "\w+ (\d+) \w+ (\d+)" test.txt
使用它计算存储在变量g中的组上的python代码：
$ red "\w+ (\d+) \w+ (\d+)" test.txt -e "int(g[0]) + int(g[1])" 3 15 19
导入任意库并执行任何操作：
$ red '\w+ (\d+) \w+ (\d+)' test.txt -i json -e '"{} => {}".format(line, json.dumps(g))'
foo 1 bar 2 => ["1", "2"]
fiz 5 baz 10 => ["5", "10"]
funk 10 bunk 9 => ["10", "9"]
如果要在eval之前执行一些python语句，也可以使用-x来完成此操作：
$ red "(\w+) (\d+).*" test.txt -x 'x = int(g[1]) ; y = g[0][::-1]' -e '(x, y)' (1, 'oof') (5, 'zif') (10, 'knuf')
使用它在所有stdin中聚合成列表ag：
$ cat test.txt | red "\w+ (\d+) \w+ (\d+)" -a "sum([int(x[0]) for x in ag])" 16
在聚合之前，对于exec，聚合有自己的-x：
$ red "(\w+) (\d+).*" test.txt -X 's = sum(int(g[1]) for g in ag)' -a 's' 16
对每一个匹配项进行求值，并根据所有匹配项进行聚合：
$ cat test.txt | red "\w+ (\d+) \w+ (\d+)" -a "sum([int(x[0]) for x in ag])" -e "'adding {}'.format(g[0])"
adding 1
adding 5
adding 10
16
也可以使用命名组，存储在变量d中并聚合到ad：
$ cat test.txt | red "\w+ (?P<first>\d+) \w+ \d+" -e "'first value is {first}'.format(**d)"
first value is 1
first value is 5
first value is 10
即使是多行也可以工作，因为传入-x的内容只是exec'd:
$ red '.*' test.txt -x '
# if you want multiline, just hit apostrophe and press enter
# and start typing
if line.startswith("foo"):
print("Line started with foo: {}".format(line))
'
Line started with foo: foo 1 bar 2
发挥创造力！：
$ cat urls.txt
https://www.google.com/
http://www.yahoo.com/
http://www.example.com/foo
$ red "(.*)" urls.txt -i requests -x 'response = requests.get(line)' -e '[response.status_code, response.content[:20]]'
[404, '<!doctype html>\n<htm']
[200, '<!doctype html><html']
[200, '<?xml version="1.0" ']
$ cat somelogfile.log
INFO: visited http://www.example.com/foo
ERROR: visited https://www.google.com/
ERROR: visited http://www.yahoo.com/
$ cat somelogfile.log | red '(?P<debuglevel>ERROR|INFO): \S+ (?P<url>.*)' -i requests,collections -x 'response = requests.get(d["url"])' -e '(response.status_code, response.content[0:20])' -a 'collections.Counter([d["debuglevel"] for d in ad]).items()'
(404, '<!doctype html>\n<htm')
(200, '<!doctype html><html')
(200, '<?xml version="1.0" ')
[('INFO', 1), ('ERROR', 2)]
免责声明
-e和-a中的代码是通过eval运行的，因此如果您粘贴某人的代码， 它会跑的。只是说。只运行您信任的代码，或亲自检查过的代码。 使用-i导入的任何库也一样。
发行说明
| 0.2.1: | Added -x for pre-eval exec, added -i for importing libraries, and -X for aggregate exec |
|---|---|
| 0.2.0: | Added -i/–import functionality |
| 0.1.1: | Path works as CLI arg |
| 0.1.0: | Version is available on pypi, with functionality of evaluation and aggregation |
| 0.0.1: | Project created |
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