GREP to find single character

I put together a GREP style inside of a paragraph style that is supposed to find all instances in the paragraph where there is one single character inside of parethesis. This is what I typed in:
(?<=$).(?-$)
and I assigned a character style that is supposed to change the character inside the parenthesis, but not the parenthesis themselves.
But it's not working. Can anyone help me with how to fix it?

For any other readers greppling with same,
(?<=$).(?=$)
[Breakdown:
(?<=x) Lookbehind string x
$ .. which is an open parenthesis -- escaped, because it's a GREP special character
. Any character. Any at all! Imagine that!
(?=y) Lookahead string y
$ .. which is a closing parenthesis -- see above]

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Am using Adobe Acrobat Pro....
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The simple answer is that you cannot replace all instances of one character using Acrobat's inbuilt tools. You're expected to edit the document outside of PDF and recreate it.

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I'm trying to find out how to use GREP in find/replace to chage the formatting of some text that comes in from a spreadsheet.
I worked out the GREP query "~b(\d\d)~b", which finds a paragraph return, followed by two digits, followed by another paragraph return
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I suppose what I'm looking for is a way for the query to find "any text between two paragraph returns, no matter what tthe length", but I don't know how to do this.All the Wildcard options seem to find just one exampler (one digit, one character etc)

And you came so far
The operators for repeat are ? (zero or once), * (zero or more) and + (once or more). You can also specify exact numbers: {at least,up to}.
All of these operators are "greedy" by default -- they will match as much as possible. To match as least as possible (which I'm sure you'll come up against, sooner or later), add another ? after the repeat expression.
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(It also introduces another code -- the parentheses operators. Look them up in a good GREP reference --lost of people are enthousiastic about Peter Kahrel's O'Reilly title, because it's about using GREP in InDesign.)
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Here's a screen shot:
I colored single dots blue, and the single-character ellipsis red. I've placed them in several combinations. When I run the GREP, here's what it finds:
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I recently have the same problem. With the help of other forum post, I was able to solve this problem in this way:
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Hello Grepers
I haven't had luck working out a Grep to find first / last occurrence of a particular word in a story.
To find the first occurrence of the word hello in a paragraph I would use this grep.
(Hello(?!=Hello*$))
For the last this works.
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Hi Marc,
Thanks for your reply, I'm glad you got my subtle hints.
1) First Hello in the paragraph(s)
Marc Autret wrote:
Also, it seems to me that the GREP patterns you've posted are wrong and only work by accident. For example:
(Hello(?!=Hello*$))
actually means: find 'Hello' if and only if the match is not followed by '=Hell' and 'o' zero or more times and an EOL.
Well Marc I made a Hell of a mistake!!!
I meant to write (Hello(?!=Hello.*$)) with a dot there which at least is not quite as stupid if not more correct.
In fact both (Hello(?!=$)) without a . and Hello(?!=^) work, well sort of work for the first Hello of the paragraph(s) depending on the were one start the search from (before the first Hello works otherwise it will find the next "first" Hello of the paragraph.
I said sort of because I naively presumed that GREP styles would work like GREPS, dumb hey.
I was really looking to use these GREPS in GREP styles, well you can't.
In a GREP style
(Hello(?!=$)) or any of its variants will apply the style to all occurrences of Hello in the paragraph.
I can partially circumvent this problem by adding a second GREP STYLE which applies an anti style to all words after the first Hello (?<=Hello).*
i.e. I have a want my first Hello to be bolded then set the first style for bold and the second to regular.
This however is not practical if one wants to auto style more than one word in this way in other words to do the same for the first Hi and the first Hello in the paragraph.
As a regular GREP solution providing that one starts the GREP search before the first occurrence of Hello It will work.
2 & 4) First and Last Hello in the story
Again these GREPs don't work using GREP styles, this I think is because GREP paragraph styles only look within the one paragraph at a time they are applied to. So they can't look at the preceding or following paragraphs to see if they contain Hello or not.
If I am correct I see no work around to this and am will to pay 10 Pounds, Euros or Dollars to whoever comes up with a non-script fully functional GREP styles solution for this (I think my money's safe)
Regarding the regular non styled GREPs they nearly work as stated.
When (?s)(Hello)(?!.*?\1) is used to find the last occurrence of Hello in the story, if the find tab is used it will firstly find the last Hello of the story then it will go back and find the one before that!! then it will go onto the next story.
Using the GREP in script works as stated.
The easiest way of course to find the first and last Hello in a story, document etc. by script would be
app.findGrepPreferences.findWhat = Hello"
myFinds = myWhatEver.findGrep();
First occurrence myFinds[0], last occurrence myFinds[-1].
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3) Last occurrence of Hello in paragraph.
This one works perfectly both with regular GREPS and GREP styles.
In summary
GREP STYLES: only the (Hello)(?!.*?\1) last Hello in the paragraph GREP works.
GREP FIND TAB: the first Hello in the paragraph GREP finds the first Hello after the cursor, the first in the story works in the limited way as written, last in story has the problem of finding the second last Hello after finding the last Hello, Last in paragraph works flawlessly.
GREP SCRIPTING: all work without problem except for the first Hello in the story that has the problem of needing to extract the last 5 letters which for my automatic text / GREP changer is a bit of a problem but for general scripting would not be problematic.
Once again Marc thanks for your input, I doubt there's much if anything to add on the topic maybe Laurent Tournie from indigrep.com might have some ideas. I don't know his contact details so if you think it's a good idea please can you send him a tweet / mail.
Regards
Trevor

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