Regex to match character in specific position and specific length

Question

I need to find string with length of 12 and contains in the 7 position the char "U".

I have the following strings:

SUPERHUMANLY
DFGDFGDFGGFG
SUPSRHTMANLY
DFGDFGUFGGFG

Only the following should matched:

SUPERHUMANLY
DFGDFGUFGGFG

Following this link I know how to get match on the 7 position:

^.{6}[U]

But I want to get match on only letters with specific length, so I tried ^.{6}[U]{12}, ^(.{6}[U]){12} and ^.{6}[U].{12} without success.

How can I combine the length of the string with the position ?

If you are not limited to regex, you may use `[s for s in my_strings if len(s) == 12 and s[6] == "U"]` ([demo](https://ideone.com/gaVc3j)) — Wiktor Stribiżew, Sep 26 '18 at 10:45

score 3 · Accepted Answer · answered Sep 26 '18 at 10:29

3

How about simple :

^.{6}U.{5}$

answered Sep 26 '18 at 10:29

Toto

2

Some explanation to answer would be great. :) – CappY Jul 16 '20 at 13:01
1

@CappY: Such basic regex doesn't really need explanation. `.` stands for any character but newline and `{5}` stands for 5 occurrences of previous character. – Toto Jul 16 '20 at 14:16

1 Answers1