regex to match character in specific position

Question

I need to come up with a regex to look for only letters A, F or E on the position 9 of a given text. I am really new with regex, did some searching and couldn't find any similar response. what i have so far is:

/^.{9}A/

This command seems to work to find letter A on the space nine, but how can I add the other 2 letters to the regex?

John Clifford · Accepted Answer · 2016-01-14 12:49:04Z

40

You say you're looking for C, F or E but looking for A in your example, so please include in the brackets any other letters you want to match, but what you're looking for is:

/^.{8}[CFE]/

It should be {8} rather than {9} because the way you had it, it'll match the first 9 characters and then match your letter in position 10.

edited Jan 14, 2016 at 12:49

answered Jan 14, 2016 at 12:45

John Clifford

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2 Comments

user6248190 Over a year ago

I am trying to do a regex match so that a password is max 8 characters long and the 4th character has to be a digit ^{3}[0-9].[a-z0-9]{8}$ this is what I have so far but I believe it is wrong

E235 Over a year ago

@user6248190 you can do it like this: ^.{3}[0-9]{5}$

Maroun · Accepted Answer · 2016-01-14 12:43:56Z

4

Use a character class:

/^.{9}[CFE]/

[CFE] matches one of C, F or E

Or use the | meta-character (alternation):

/^.{9}(?:C|F|E)/

answered Jan 14, 2016 at 12:43

Maroun

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Maroun Over a year ago

@tchelidze Adding $ will solve the problem (if OP wants). I'm not sure what language/tool they're using.

hacker · Accepted Answer · 2019-05-28 19:42:09Z

2

This way can also solve the problem

/^.{8}A|^.{8}F|^.{8}E/;

you have to use 8 instead of 9 if you want to match the character on the 9th position

answered May 28, 2019 at 19:42

hacker

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