Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

regexp question.

  • 06-08-2006 1:18pm
    #1
    Hobbes
    Registered Users, Registered Users 2 Posts: 21,264 ✭✭✭✭


    Trying to figure out what this is supposed to be doing (I don't have the input text for it :/ ).

    This is what is searching for.

    "(?i)\\b" + value + "\\b"


Comments

  • #2
    utopian
    Closed Accounts Posts: 139 ✭✭utopian


    Hobbes wrote:
    Trying to figure out what this is supposed to be doing (I don't have the input text for it :/ ).

    This is what is searching for.

    "(?i)\\b" + value + "\\b"

    This should match \bvalue\b case-insensitively.

    The (?i) turns on the case-insensitive modifer, and the \\ is an escaped \.


  • #3
    Hobbes
    Registered Users, Registered Users 2 Posts: 21,264 ✭✭✭✭Hobbes


    As far as I Could see the \b means backspace?

    I had a problem with some code and traced it to that regexp. Oddly enough as soon as I remarked out that line everything worked fine.


  • #4
    utopian
    Closed Accounts Posts: 139 ✭✭utopian


    Hobbes wrote:
    As far as I Could see the \b means backspace?

    I had a problem with some code and traced it to that regexp. Oddly enough as soon as I remarked out that line everything worked fine.

    Or a word boundary i.e. the writer wants to match "value" on its own (not valued etc.).

    However, the \\b escapes the backslash, so evaluates to the literal '\b'. I presume this is not what the writer intended.

    Having said that, in some languages, you may need to use \\b to have \b sent to the regexp parser. In python, you get around this by using raw strings e.g. re.compile(r'\bvalue\b') is equivalent to re.compile("\\bvalue\\b").

    Edit: lots more on word boundaries


Advertisement