PHP-General - What is the best function to replase these strings?

Hi
i have a string such as this :

is there any php function to replace the first red one to "#" and the last red one to "/#"
?
or i have to write an algorithm?

Regards

Are they all that one string? Or do you mean for the black text to be variable?

what is @ for? in php, if you want to replace a string use str_replace()

Syntax:

str_replace(find,replace,string,count)

not actually !
i have numbers of string such as these :

and want to replace first red one and last red one to other character.(html tags)


i see,but it can't do it.it is a special form of replace.

So now you've changed your bounding characters as well?

What is the actual problem? You have strings WHERE, bounded by WHAT, and containing WHAT?

Are these strings in a database, or just randomly in a big file?

What are the bounding characters? Just #? #, @, !? Any special character?

What can be in the middle of these strings? Whitespace? Other special characters? Other bounded blocks?

What do you want them to look like?

Replace the red characters? If you copy/pasted your example then you're using BBCode.

Not sure if you want to keep the red coloring though.

I don't know there is any function in php do that

No,this is a text file.not in database

no just these and + some character such as '*' , 'bq.' etc.

any change.for example. i want to replace "!" with =>> '<img src="' plus follow text and last "!" replace with =>> ' "/> '

these are murkup editor codes,i want to convert it to tinyemce. thats it
and thanks for your reply

What happens when your content contains multiple email addresses or multiple questions?

Look at this post right here, do you see the problem?

There's two question marks. Do you really want to remove them both and make my second sentence red or whatever?

If you're trying to make a markup parser, you'll have to do it by hand. They are very, very complicated. You have to step through the string one character at a time looking for your markup, keeping track of your depth in the string and which tags you've already found. Since your "tags" are random, and variable length, you have to also keep a list of all possible tags, and make sure that you match closing tags case-insensitively.

Look into how to write a markup parser, or check out the source code of the bbcode parsers.

thanks
in my point of view , i have to write my own functions

regards

Use a regex and bound to '^' and '$' for the start and end of the string

or use substr_replace to replace the first and last symbols in the string

or use substr to pull all but the first and last characters of the string ...

These strings exist mixed throughout a big text file. It's hard to tell because he absolutely refuses to show you some actual data, instead he keeps listing fake examples.

oh great !
is there any exact example?
thanks for your reply.

You can look these functions up on http://php.net, or you could help us to help u by providing some live data

The initial sample you gave is some badly formed php code, because of the multiple closing braces on the same line, if we deliver what it is you initially requested there's a very good chance your entire codebase will be rendered less than useless, and if you're doing that in tinymce then you have bigger issues than that.

default: break; <-- pointless

Use with extreme caution, and back up your data first ...

Note that everything Axweildr is saying assumes you have these strings just as you've presented, them. That is, "@hello@" is by itself in its own file or database field with no other content around it. You have made it clear that's not how you have your data, so this will not work for you.