Re: Reg-exp

[David Forrest]

On Thu, 22 Aug 2002, J. Thomas wrote:

>
> I'm interested in doing a query search and replace for a regular
> expression that goes something like this:
>
> 1. find a particular string (e.g. "test") followed by any 3 random
>
>    characters or numbers (e.g. "test100", "test234", "test_al")
>
> 2. replace an occurence with the random 3 characters/numbers followed by
>
>    "test" (e.g. "100test", "234test", "_altest).

I would try:

M-x query-replace-regexp
 \(test\)\([0-9a-zA-Z_]+\)
 \2\1

the \( \)  pair defines groups which are refered to as \1 and \2 in the
replacement.  This doesn't do the exact 3 that you want, but I don't know
if emacs has a bounding operator like {3} or {2,4} so if the 'one or more'
operator '+' wont do what you want, you could do the repeat manually:

  \(test\)\([0-9a-zA-Z_][0-9a-zA-Z_][0-9a-zA-Z_]\)

>
>
> How would I go about doing this?
>
> Thanks,
> jt
>
>
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> Jason Thomas
> Graduate Student
> Dept. of Sociology
> University of Washington, Seattle
> method@u.washington.edu
> http://students.washington.edu/~method
>
>
>
>
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>

-- 
 Dave Forrest                                   drf5n@virginia.edu
 (804)642-0662h (434)924-3954w  http://mug.sys.virginia.edu/~drf5n/