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Do know about precedence since disregarding it is one of the highest crime in regex country: I've made a sample common mistake not paying attention to precedence and I use this as a chance to pillory myself giving a perfect example of what not to do. In node Re: Short or Long Hand I was using an alternation being based on anchors: /^0|6$/ This simply says match 0 at the beginning or match 6 at the end while my intention was to match 0 or 6 ranging from beginning to the end of the string: /^(?:0|6)$/ As an addition to your tutorial I'd like to see the basic requirement for regexes: • You can't write an efficient regex as long as you don't know what your expected data will be: Always think of the expected data while changing or simplifying regexes. I personally like the term 'regexpected' Keep it in mind and it will save your life ;-) Please feel free to downvote node Re: Short or Long Hand /me castigating myself for not paying attention to precedence In reply to Re: [Try-out] Regexp do's and don'ts
by Dietz
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