Re: regular expression

On 2 June 2010 06:12, Peter <peters@egrabber.com> wrote: > Hi  Tanel, > > 1. only letters > > $str = 'helloworld'; > > if(preg_match("/^[a-zA-Z]*$/",$str)) > echo "only letters"; > else > echo "failed"; > > 2. only letters and spaces > > $str = 'hello world'; > > if(preg_match("/^[a-zA-Z\s]*$/",$str)) > echo "only letters and spaces"; > else > echo "failed"; > > > Regards > Peter.M Be careful with using *. The issue of a zero length string is important. * will allow a zero length string. ++ will force the regex to match something, so zero length strings are rejected. /s will match space, formfeed, newline, carriage return, horizontal tab, and vertical tab So a string with newlines (for example a <textarea> with line breaks) would match. -- ----- Richard Quadling "Standing on the shoulders of some very clever giants!" EE : http://www.experts-exchange.com/M_248814.html EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 ZOPA : http://uk.zopa.com/member/RQuadling