Regex to find sentences starting and ending with-CodePudding

I am writting a REGEX to find sentences starting with _@_ and ending with __d__. d can be 1 or 2 digit.
For example, I have this expression

getting a regex _@_enter text  text . tex, text here__2___2_ te xt text .

and would like to get

_@_enter text  text . tex, text here__2__

Here is my try.

^(_@_)?.*\n\_\_\d{1,2}\_$/gm

Could someone please tell me what is wrong with this ?

CodePudding user response：

Try this

/(_@_)(. ?)(_\d{1,2}_)/gm

CodePudding user response：

If the match can be over 2 lines, you can optionally match the rest of the current line followed by a newline after matching _@_.

_@_(?:.*\n)?.*?__\d\d?__

Explanation

_@_ Match literally
(?:.*\n)? Optionally match the rest of the line followed by a newline
.*? Match any character except a newline, as few as possible
__\d\d?__ Match 1 or 2 digits between __

See a regex demo

const regex = /_@_(?:.*\n)?.*?__\d\d?__/g;
const str = `getting a regex _@_enter text  text . tex, text here__2___2_ te xt text .

getting a regex _@_enter text  text . 
tex, text here__3___3_ te xt text .


getting a regex _@_enter text  text . 

tex, text here__4___4_ te xt text .`;

console.log(str.match(regex));

CodePudding user response：

A deviation from @Sect0R s answer that also matches sentences over multiple lines but doesn't need the s modifier:

(_@_)((?:.|\n) ?)(__\d{1,2}__)

(And it looks for two _ around the end-sentence-number.)