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Double letters?
Posted: Sun May 13, 2012 1:51 am
by dfhtextpipe
Hi Simon,
Is there an easy method to search for double letters?
David
Re: Double letters?
Posted: Mon May 14, 2012 12:55 pm
by DataMystic Support
Yes David,
Just use a perl pattern of
Re: Double letters?
Posted: Tue May 15, 2012 12:31 am
by dfhtextpipe
Did you understand my question?
I want a simple method to find double letters, not just two letters that may or may not be the same.
(aa|bb|cc|dd ... |xx|yy|zz) would do it, but there must be a shorter pattern, surely.
David
Re: Double letters?
Posted: Tue May 15, 2012 8:31 am
by DataMystic Support
Hi David,
[a-z]{2} will find two letters, what I wrote first does in fact work!
Re: Double letters?
Posted: Wed May 16, 2012 1:53 am
by dfhtextpipe
How amazing!
I'm still struggling to understand how it does work.
Code: Select all
000084 aa
000018 ee
000406 ii
000021 oo
000009 ss
000009 uu
000223 vv
David
Re: Double letters?
Posted: Wed May 16, 2012 8:32 am
by DataMystic Support
\1, \2 etc in perl parlance refer to the previously matched text in captured sub-pattern 1, 2 etc.