Assuming that "randomstring" doesn't contain the enclosing strings "A" or "B", you can use two calls to pos to extract the string:. Learn more. Extract string between two strings Ask Question. Asked 7 years, 3 months ago. Active 7 years, 3 months ago. Viewed 7k times. For example: A randomstring B. Nuno Jemaio.
Nuno Jemaio Nuno Jemaio 2 2 silver badges 10 10 bronze badges. I cannot speak for others, but I have problems to understand what you want. Can you give a concrete example? UweRaabe This should make it more clear : Strings not chars! I don't understand your question either. Give a concrete example please. Active Oldest Votes. Uwe Raabe Uwe Raabe I have a recursive version of this which populates a String Array NGLN This might fail when Delim2 appears before or inside Delim1.
If you can exclude this situation, your solution works, too. Btw: Str is the name of a built-in procedure and should be avoided for variable names.
Answer with regular expression : uses RegularExpressions; Match Input ; if Match. Success and Match. Value; end; procedure TForm1. NunoJemaio: the nice thing is that the same pattern would also work for case insensitive search just add option to TRegEx. For example at the front or end of url's. Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home?S is an expression of a string or dynamic-array type. Index and Count are integer-type expressions. Copy returns a substring or subarray containing Count characters or elements starting at S[Index].
The substring or subarray is a unique copy that is, it does not share memory with S, although if the elements of the array are pointers or objects, these are not copied as well. If Index is larger than the length of S, Copy returns an empty string or array.
If Count specifies more characters or array elements than are available, only the characters or elements from S[Index] to the end of S are returned. Note: When S is a dynamic array, you can omit the Index and Count parameters and Copy copies the entire array. System Description See Also. Collapse All. Returns a substring of a string or a segment of a dynamic array.
The code represents the OnKeyPress event handler of the combo box, which performs most of the default keystroke handling before finding a matching list item and updating the text. That case must be caught in the OnKeyDown event handler instead. Add S ; end ; procedure TForm1. Create; Graphics. See Also. Copyright C Embarcadero Technologies, Inc.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Altar the Copy function in Delphi is a intrinsic function this means which is handled by the compiler rather than the run-time library. Copy is a "compiler magic" routine, it is handled intrinsically by the compiler depending on what parameters you pass it ANSI string, string, or dynamic array.
The problem is that the WideString must be saved onto am Array of Char inside a file. So mix types must be done Solution2: Convert WideChar to Char prior to assing. Learn more. Ask Question. Asked 8 years, 11 months ago. Active 6 years, 8 months ago. Viewed 5k times. Migrate2Lazarus see my profile. Migrate2Lazarus see my profile Migrate2Lazarus see my profile Why not accept the answer?
If you ask me, the real question is "why oh why did CodeGear decide to change the string type in the first place? Who, in their right minds decides to break pretty much all existing code? Active Oldest Votes. ClassName, ': ', E. Message ; end; Readln; end. Now check the assembly code Project I use mixed types so this is why the compiler complains.
How should I proceed? Mixing your strings is a performance nightmare. Not so easy I had to create my own set of dedicated functions to handle UTF-8 strings with best performance available under Unicode version of Delphi.
Function overloading may be difficult to track. Ondrej Kelle Ondrej Kelle You don't have to typecast, and the compiler doesn't complain. Think of it as an overloaded procedure where one of the overloaded versions accepts ANSI string parameters. Altar if you not mix unicode strings and ansi strings in the same call to Copy you will not receive any complains of the compiler.Delphi Basics. Best hosting provider VPSServer. It gives an introduction to the Delphi Object Oriented Language for newcomers, and provides a ready reference for experienced programmers.
It limits itself to a broad base of the language in order to keep things simple and manageable. The approach taken is to present the most useable basics of Delphi Programming in as accessible a manner as possible. Feel free to contact the author about any aspects of the site.
Every effort will be made to respond to all emails received. New : An independent review of "Learn to program in Pascal"an online course for those starting out on Delphi programming. Delphi Basics as a downloadable Windows program. It looks and behaves like the site, but with the added benefits of : No adverts Search facility for finding Run Time Library entries and. Net Methods. By Functionality. Data types. Integers, ordinals Floating point types String, char types Pointer types Other types.
Program control Program data Looping Logic Object orientation. Control options Data options. Operations Data access File name handling. Strings and chars. Operations Conversions from Conversions to Displaying. Calculations Conversions from Conversions to Values Displaying. By Unit. Classes Dialogs Types Variants. By Category. All rights reserved. Contact me using neil dot moffatt at ntlworld.It's hard to answer that without an example of what you are doing. Copy always requires allocating a new chunk of memory which has some cost.
Delete usually does not, but there's still some overhead in deciding that. You can reference strings character by character, but Copy is about as efficient as you can get if you want to look at a group of characters as an entity. You may want to post a brief example of what operation you're trying to perform and someone can critique the code. Good luck.
Kurt D Whale Delphi Developer. If you are not sure that the string operations are the culprits I'd suggest that you take the time to isolate the section s of code that are measurably slowing the program. The process of doing so may well lead to a solution, if one is required. It would be a shame to spend time recoding, debugging and testing something only to find out that the original code was just fine.
Iain Macmilla Delphi Developer. That is pretty slow too. Something on these lines usually works pretty fast. Using Copy, Pos and Delete.
Kurt Barthelmess [Team. Re:Using Copy, Pos and Delete. D Whale. Bruce Robert. Iain Macmilla. Other Threads 1. Add how? Can not delete using TQuery.
Delete 4. Using POS to strip away illegals. Deleting and copying files in DOS 7.The comparison is NOT case sensitive and does not consider the Windows locale settings. The return integer value is less than 0 if S1 is less than S2, 0 if S1 equals S2, or greater than 0 if S1 is greater than S2. This function is obsolete, i. Description: Returns a substring of a string or a segment of a dynamic array. S is an expression of a string or dynamic-array type.
Index and Count are integer-type expressions. Copy returns a string containing a specified number of characters from a string or sub array containing Count elements starting at S[Index]. If Index is greater than the length of S, Copy returns a zero-length string "" or an empty array.
If Count specifies more characters or array elements than are available, only the characters or elements from S[Index] to the end of S are returned. To determine the number of characters in string, use the Length function.
Description: Removes Count characters from a string S, starting at Index. Delphi leaves the string unchanged if Index is not positive or greater than the number of characters after the Index.
If Count is greater than the rest of the characters after the Index, the rest of the string is deleted. Description: Fills a string list with substrings parsed from a delimited list. Separators are a set of characters that are used as delimiters, separating the substrings, where Carriage returns, newline characters, and quote characters single or double are always treated as separators. WhiteSpace is a set of characters to be ignored when parsing Content if they occur at the beginning of a string.
Content is the null-terminated string to parse into substrings. Strings is a string list to which all substrings parsed from Content are added. The function returns the number of strings added to the Strings parameter.
What do I wrong? With other functions like StringReplace it works fine. Here is an example code:.
You are passing the arguments of the Pos function in a wrong order, first you must pass the substring to search and then the buffer string. Learn more. Find line break with Pos in Delphi Ask Question. Asked 6 years, 5 months ago. Active 6 years, 5 months ago. Viewed 5k times. Create; sl. Add 'Hello' ; sl. Add 'world' ; sl. Add '!
String Handling Routines: Delphi Programming
StanE StanE 1, 20 20 silver badges 30 30 bronze badges. Even if you did pass the arguments of Pos in the right order, it's a peculiar example, since sl. Text will build the resulting string from an internal array of strings, using a fixed EOL delimiter. Active Oldest Votes. Oh man I just feel so stupid.
TStringHelper classeg: uses SysUtils; if sl. Note that such code is 0-based, not 1-based. Sign up or log in Sign up using Google. Sign up using Facebook.
Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Triage needs to be fixed urgently, and users need to be notified upon….