Re: Regular Expression help

Chris Boget wrote:

<?php echo 'Is String: [' . ( is_string( 'a1b2c3' ) && preg_match( '/[A-Za-z]+/', 'a1b2c3' )) . ']<br>'; echo 'Is Numeric: [' . ( is_numeric( 'a1b2c3' ) && preg_match( '/[0-9]+/', 'a1b2c3' )) . ']<br>'; echo 'Is String: [' . ( is_string( 'abcdef' ) && preg_match( '/[A-Za-z]+/', 'abcdef' )) . ']<br>'; echo 'Is Numeric: [' . ( is_numeric( '123456' ) && preg_match( '/[0-9]+/', '123456' )) . ']<br>'; ?> Why is the first "Is String" check returning true/showing 1? preg_match should fail because 'a1b2c3' contains numbers and, as such, doesn't match the pattern...

It does match the pattern. The expression says "1 or more A-Za-z in sequence". If you want to check against the whole string you need to add the start and end markers... preg_match( '/^[A-Za-z]+$/', 'a1b2c3' )) Look at the manual page for preg_match and read up on the third parameter. Use it to see what is matching the expression. -Stut