Regular Expressions two strings

Question

I do not understand much about regular expressions. I hope you can help me.

I have in a file the date of some files

Aug 15:07 file1.txt
Jul 15:04 file2.txt
Aug 15:05 file3.txt
Aug 15:05 file4.txt
Aug 2016 file5.txt
Jul 15:09 file6.txt

I want only files that start with 'Aug' AND have the time (:)

/^Aug :/

But doing that shows me all the files without exception

What is your environment/Language? Python/Javascript etc? Generic regex will be like https://regex101.com/r/mNyJsF/1 — Saleem, Aug 22 '17 at 16:46
If you are using `findstr`, that is not qiote a regex, or at least a very limited one. — Wiktor Stribiżew, Aug 22 '17 at 20:39

score 1 · Answer 1 · answered Aug 22 '17 at 16:45

1

This will look for filenames starting with 'Aug :' an this is not what you want.

Try /^Aug [0-9]{1,2}:/ instead. It looks for filenames which:

start with 'Aug '
then one or two digits
then the colon

Also, what is the bash command you're running ?

(You can test your regex at regex101.com, it's a good website or that ;-) )

answered Aug 22 '17 at 16:45

Valentin Coudert

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Thank you! But I'm using BATCH and it does not work :( – Danielle Aug 22 '17 at 17:07
In `findstr` regex, limiting quantifiers are not supported. – Wiktor Stribiżew Aug 22 '17 at 20:41
I don't know `findstr` but maybe you can use what's described here https://stackoverflow.com/a/5249797/6408940 – Valentin Coudert Aug 23 '17 at 07:36

score 1 · Answer 2 · answered Aug 22 '17 at 16:47

1

Use this Pattern ^Aug\s+[0-9]+:[0-9]+\s+(.+$) Demo

^           # Start of string/line
Aug         # "Aug"
\s          # <whitespace character>
+           # (one or more)(greedy)
[0-9]       # Character in [0-9] Character Class
+           # (one or more)(greedy)
:           # ":"
[0-9]       # Character in [0-9] Character Class
+           # (one or more)(greedy)
\s          # <whitespace character>
+           # (one or more)(greedy)
(           # Capturing Group (1)
  .         # Any character except line break
  +         # (one or more)(greedy)
  $         # End of string/line
)           # End of Capturing Group (1)

answered Aug 22 '17 at 16:47

alpha bravo

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In `findstr` regex, `+` and shorthand character classes like `\s` are not supported. – Wiktor Stribiżew Aug 22 '17 at 20:41
@WiktorStribiżew, the OP didn't specify anything about `findstr` at the time I gave an answer – alpha bravo Aug 23 '17 at 17:46

Regular Expressions two strings

2 Answers2