Removing certain items in a string:Use a regex or for loop?

I want to write a snippet of code that would delete the period at the end of sentences.
However, periods that precede lowercase letters should NOT be removed.
Examples of strings that should NOT remove the period
* Go by 123 Abc St. and C street
* e.g., here
* this is a longstate... followed by


Examples of strings that should have their periods removed
"That's something." Bob said. He was being... As always. Don't you know?
Becomes:
"That's something" Bob said He was being As always Don't you know?

Is there one regex I could write or should I just use a for-loop and iterate through the strings and keep track of the periods and capitalized letters?

Any ideas would be greatly appreciated!
Thanks!

 

Thanks for your suggestion!
But here is a string where I DO NOT remove the period.
"That's something." like I said

Notice how the letter is lowercase after the period even though there's a " after the period.

Anyone else have any other ideas?

 

Can you reply with an example input and expected output.

 

Here's an example input and output

Input:
"That's something." Bob said. He was being... As always. Don't you know?

Output:
"That's something" Bob said He was being As always Don't you know?


Examples of strings that should NOT remove the period since the letter following the period is not uppercase
* Go by 123 Abc St. and C street
* e.g., here
* this is a longstate... followed by

 

http://gnosis.cx/publish/programming/regular_expressions.html

That could help you out, good luck.

 

<?php
$str = '"That\'s something." Bob said. He was being... As always. Don\'t you know?';

//remove a dot/full-stop if its followed by a capital letter.
$str = preg_replace('~\. (?=[A-Z]{1})~', ' ', $str);

//remove a dot/full-stop if its followed by "
$str = str_replace('." ', '" ', $str);

echo $str;
?>

PHP:

 

Thanks danx10!

But I notice your preg_replace doesn't replace multiple periods in the same sub string.
For example:
He was being... As always
should be
He was being As always


But good job so far!

 

<?php
$str = '"That\'s something." Bob said. He was being... As always. Don\'t you know?';

//remove a dot/full-stop if its followed by a capital letter.
$str = preg_replace('~[\.]+ (?=[A-Z]{1})~', ' ', $str);

//remove a dot/full-stop if its followed by "
$str = str_replace('." ', '" ', $str);

echo $str;
?>

PHP:

 

How would I remove the periods before the quote?
For example:

Input:
"That's something..." Bob said. He was being... As always. Don't you know? Like "the..." never "the..." Cat

Output:
"That's something" Bob said He was being As always Don't you know? Like "the..." never "the" Cat

 

<?php
$str = '"That\'s something." Bob said. He was being... As always. Don\'t you know?';

//remove a dot/full-stop if its followed by a capital letter.
$str = preg_replace('~[\.]+ (?=[A-Z]{1})~', ' ', $str);

//remove a dot/full-stop if its followed by "
$str = preg_replace('~[\.]+" ~', '" ', $str);

echo $str;
?>

PHP:

 

Great! Thanks everyone!