Hi,

Is there a way to transform user input string to a regular expression? For example, I want to write a `grep`-like program

```
mygrep -E '/pattern/i' file.txt
```

and here the user's parameter `/pattern/i` would be converted to a Regex object.

Fyi, in Ruby, `to_regexp` is a useful gem: https://rubygems.org/gems/to_regexp

Thanks a lot.

On Saturday, 16 September 2017 at 03:18:31 UTC, Ky-Anh Huynh wrote:
> Is there a way to transform user input string to a regular expression? For example, I want to write a `grep`-like program

import std.regex;

auto re = regex(user_pattern, user_flags);


You'll probably want to split it on the '/' to split the pattern and the flags since they are two separate variables to the regex function, but that's all you need to do.

http://dpldocs.info/experimental-docs/std.regex.regex.2.html

On Saturday, 16 September 2017 at 03:23:14 UTC, Adam D. Ruppe wrote:
> On Saturday, 16 September 2017 at 03:18:31 UTC, Ky-Anh Huynh wrote:
>> Is there a way to transform user input string to a regular expression? For example, I want to write a `grep`-like program
>
> import std.regex;
>
> auto re = regex(user_pattern, user_flags);
>
>
> You'll probably want to split it on the '/' to split the pattern and the flags since they are two separate variables to the regex function, but that's all you need to do.
>
> http://dpldocs.info/experimental-docs/std.regex.regex.2.html


Thanks Adam. I will give it a try.