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Re: how does this regular expression works

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On 13 July 2011 14:04, Shahriyar Imanov <shehi@xxxxxxxxxxx> wrote:
> \<head.*?\>(?P<head_tag_innerHTML>.*?)\<\/head\>



<head.*?>(?P<head_tag_innerHTML>.*?)</head>

Options: case insensitive; ^ and $ match at line breaks

Match the characters “<head” literally «<head»
Match any single character that is not a line break character «.*?»
   Between zero and unlimited times, as few times as possible,
expanding as needed (lazy) «*?»
Match the character “>” literally «>»
Match the regular expression below and capture its match into
backreference with name “head_tag_innerHTML”
«(?P<head_tag_innerHTML>.*?)»
   Match any single character that is not a line break character «.*?»
      Between zero and unlimited times, as few times as possible,
expanding as needed (lazy) «*?»
Match the characters “</head>” literally «</head>»


Created with RegexBuddy


Escaping < > ? at the wrong time is simply a redundancy. Learning when
to escape is just like learning a new language.

You only need to escape anything if you need it to be a literal character.

e.g.

something.html vs something\.html


-- 
Richard Quadling
Twitter : EE : Zend : PHPDoc
@RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea

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