I am new to regular expressions, and I am just tired by really studying all of the regex charatcer and all. I need to know what is the purpose of greater than symbol in regex for eg:
preg_match('/(?<=<).*?(?=>)/', 'sadfas<[email protected]>', $email);
Please tell me the use of greater than symbo and less than symbol in regex.
The greater than symbol simply matches the literal > at the end of your target string.
The less than symbol is not so simple. First let's review the lookaround syntax:
The pattern (?<={pattern}) is a positive lookbehind assertion, it tests whether the currently matched string is preceded by a string matching {pattern}.
The pattern (?={pattern}) is a positive lookahead assertion, it tests whether the currently matched string is followed by a string matching {pattern}.
So breaking down your expression
(?<=<) assert that the currently matched string is preceded by a literal <.*? match anything zero or more times, lazily(?=>) assert than the currently matched string is followed by a literal >Putting it all together the pattern will extract [email protected] from the input string you have given it.
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