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regular expression syntax

those regular expressions seem to be quite perplexing for me to understand it. but it is so frequently used and is also very important when using replace functions. i had read through the php documents on regular expressions syntax but i still don't understand how to use them very well.
is there a website which, or anyone who, can elaborate it in a more clearer and easier way to understand?
thanks

http://www.regular-expressions.info/

i unno if you saw this, but here it is anyways. www.php.net/pcre

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Neverside Development Director
PHP Snippets
BigToach.com - IT WORKS, TOACHY!

thanks for the sites...
hmm...i read some and i am quite confused with the difference between a + and an *
both loops something but when i look into the php.net/pcre,
it says * is 0 or more quantifier and + is 1 or more quantifier
what does it mean?

something like this
you wanna find at least 1 instance of something then you use + but if you wanna see if it is there or it isnt. here is an example
1.) find a string that starts with the letter a
/^a+/i
2.) find a string that starts with big and can have anything else after it
/big*/i (so it could be 'big', 'bigtoach' etc)

___________________

Neverside Development Director
PHP Snippets
BigToach.com - IT WORKS, TOACHY!