• Ky-Anh Huynh (11/11) Sep 15 2017 Hi,
• Adam D. Ruppe (8/10) Sep 15 2017 import std.regex;
• Ky-Anh Huynh (3/13) Sep 16 2017 Thanks Adam. I will give it a try.

Ky-Anh Huynh <saigon example.net> writes:

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.

Adam D. Ruppe <destructionator gmail.com> writes:

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

Ky-Anh Huynh <saigon example.net> writes:

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.