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This is very simple to do with find, but I will use it for Under the assumption that if there is no comma, then it is first name followed by
CUT THE STRINGS CREDIT LETTER FULL
You want your program to determine which form the user entered the full name in, The user could enter it in the form of first nameįollowed by last name (e.g., "Carlos Moreno"), or in the form of last name,įollowed by comma, followed by first name (e.g., "Moreno, Carlos"). A pattern with several components (or severalĬonditions) can be specified in a single operation, providing extra flexibility.Ī simple example of pattern matching is the following: suppose that a program asks This is a much more flexible and powerful tool than the basic search facilities that Of strings described by the regular expression). If another string matches it (i.e., if the other string belongs to the family Regular expressions provide a mechanism for pattern matching between two strings Ī regular expression is a fragment of text (a string) defining a pattern thatĭescribes a family of fragments of text. Tutorial will be useful when C++0x becomes official and compilers start supporting Similar to (since they're based on) Boost's facilities, so what you learn from this
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Still, C++ native regular expression facilities are very However, this is still not the case (compilers provide experimental supportįor this and other new features in C++0x), so in this tutorial, I stick to the solidīoost library facilities.
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Library), in the upcoming revision of the language, the so-called “C++0x”
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The following fragment of code shows how to test if a string contains at least two spaces. Optional starting position when using find or rfind Which means that the value must be between 0 and length−1īrainteaser: there is an additional condition related to the The requirementįor this optional parameter is that it must indicate a valid position within the string, Occurence while moving backwards starting at the specified position. Last occurence before the position inticated - you could look at it as the first The position indicated the rfind method will return the position of the Will tell the position of the first occurrence of the search string or character after For both cases (searching for a single character or searching for a substring), youĬan specify a starting position for the search in that case, the find method