Thread: pattern matching

  1. #1
    Registered User
    Join Date
    Dec 2002

    Question pattern matching

    Can someone give me an example of how you do pattern matching in a string? For instance, if there's more than one decimal point in a string, or if there is a + or - that's embedded in the string / not the leading character of the string?


  2. #2
    C > C++ duders ggs's Avatar
    Join Date
    Aug 2001
    regexp can be used to deal with things like this.. but i don't know how to use it

    you could break the string down into fields, maybe one type for all numbers, another type for a decimal or a plus.. and then use a simple test of the sequence of fields (maybe driven by a table) to figure out which format the string is in. (to build the fields, you might use a linked list and loop through the string, adding a new field after processing all the data that belongs in a single field..)
    .sect signature

  3. #3
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    strstr - find a string in a string
    strchr - find a character in a string

    Hope is the first step on the road to disappointment.

  4. #4
    CS Author and Instructor
    Join Date
    Sep 2002


    There are two major pattern matching algoritims:

    Boyer-Moore and KMP- Knuth Morris Pratt

    check them out
    Mr. C: Author and Instructor

  5. #5
    Registered User
    Join Date
    Jan 2003
    Does C support Regular Expressions?

  6. #6
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    Originally posted by _Cl0wn_
    Does C support Regular Expressions?
    Not in the standard. But some compilers have things like this
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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