word-boundary

I'm getting unexpected results with this code: 'foo'.match(new RegExp('\bfoo\b')); // Returns null Why is this returning null while this one returns "foo"? 'foo'.match(new RegExp('foo')); // Returns "foo" Doesn't a word boundary marker match the beginning and end as well? EDIT: I need the regular expression itself to be a string because I am injecting variables into it. Escape the backslashes 'foo'.match(new RegExp('\\bfoo\\b')); Don't wrap it in quotes... instead, do this:- 'foo'.match(new RegExp(/\bfoo\b/)) 来源： https://stackoverflow.com/questions/5024623/word-boundary-wont-match-the

I am attempting to scan a string of words and look for the presence of a particular word(case insensitive) in an XSLT 2.0 stylesheet using REGEX. I have a list of words that I wish to iterate over and determine whether or not they exist within a given string. I want to match on a word anywhere within the given text, but I do not want to match within a word (i.e. A search for foo should not match on " foo d" and a search for bar should not match on "re bar "). XSLT 2.0 REGEX does not have a word boundary( \b ), so I need to replicate it as best I can. You can use alternation to avoid repetition

I would like to match the following expression in bash: ^.*(\b((720p)|(1080p)|(((br)|(hd)|(bd)|(web)|(dvd))rip)|((x|h)264)|(DVDscr)|(xvid)|(hdtv)|(ac3)|(s[0-9]{2}e[0-9]{2})|(avi)|(mp4)|(mkv)|(eztv)|(YIFY))\b).*$ Really all I want to know is whether one of the words of the string tested is one of the words described in this regex ( 720p , 1080p , brrip , ...). And there seems to be an issue with the word boundaries. The test I use is [[ $name =~ $re ]] && echo "yes" where $name is any string and $re is my regex expression. What am I missing? \b is a PCRE extension; it isn't available in POSIX

Regular expression engines have a concept of "zero width" matches, some of which are useful for finding edges of words: \b - present in most engines to match any boundary between word and non-word characters \< and \> - present in Vim to match only the boundary at the beginning of a word, and at the end of a word, respectively. A newer concept in some regular expression engines is Unicode classes. One such class is script, which can distinguish Latin, Greek, Cyrillic, etc. These examples are all equivalent and match any character of the Greek writing system: \p{greek} \p{script=greek} \p

I am working on a solution to split long lines of Khmer (the Cambodian language) into individual words (in UTF-8). Khmer does not use spaces between words. There are a few solutions out there, but they are far from adequate ( here and here ), and those projects have fallen by the wayside. Here is a sample line of Khmer that needs to be split (they can be longer than this): ចូរសរសើរដល់ទ្រង់ដែលទ្រង់បានប្រទានការទាំងអស់នោះមកដល់រូបអ្នកដោយព្រោះអង្គព្រះយេស៊ូវ ហើយដែលអ្នកមិនអាចរកការទាំងអស់នោះដោយសារការប្រព្រឹត្តរបស់អ្នកឡើយ។ The goal of creating a viable solution that splits Khmer words is twofold: it