Tuesday, July 31, 2018

Re: how to match the first pattern

On Jul 30, 2018 um 18:46:42, Sand Glass wrote:
> On Monday, July 30, 2018 at 8:13:26 PM UTC+8, Tony Mechelynck wrote:
> >
> > Ah yes, there are several regular-expression "dialects", often quite
> > similar but not always strictly identical, and depending on whether
> > you are using grep (which has two: "normal" and "extended"), Vim
> > (which has four: "very nomagic", "nomagic", "magic" and "very magic"),
> > perl, less, etc. you need to always use just the precisely right
> > dialect for whichever RE engine will be interpreting it.
> >
> > Best regards,
> > Tony.
>
> I use some simple regular expression in 'windows search', 'notepad++
> search', 'ultraedit search', 'visual studio ENV'. The regular
> expression is so precisely that I cannot remember all of them. So
> each time when I using RE in a programming language(c/cpp) or a
> tool, I will try and try again, until the result is I want.
> Before I post this topic, I only try '*', '.', '+', '?' for RE
> matching. After I post the topic, I learned the '{n,m}', '-'. Thanks
> a lot.
> By the way, find a help doc is another way. This is the perl RE
> online doc:
> For more options, visit https://groups.google.com/d/optout.
> http://perldoc.perl.org/perlretut.html#Matching-repetitions
>

If you are on Linux, you can test 'txt2regex'.

apt show txt2regex
Package: txt2regex
Version: 0.8-5
Description: A Regular Expression "wizard", all written with bash2
builtins
^txt2regex$ is a Regular Expression "wizard", all written with bash2
builtins, that converts human sentences to RegExs. With a simple
interface, you just answer to questions and build your own RegEx for a
large variety of programs, like awk, emacs, grep, perl, php, procmail,
python, sed and vim. There are more than 20 supported programs.

Just my 2¢
Michael

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