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Questions tagged [substring]

Part of a string, or the function/method that returns part of a string

substring functions/methods come in basically two flavours:

  • The parameters to the function are start index and length.
    • SQL's version uses this flavour, notably using one-based indexing
  • The parameters to the function are start index and end index. C like languages (including Java) use this flavour, and all use zero-based indexing

Definition

  • A substring is a string contained in a given string.

  • The substring can start at any index of the given string and finish in any index within the given string following the start.

  • It can be an empty string, the entire given string, or (most likely) a shorter string completely encompassed by the given string.

See Also

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Is Javascript substring virtual?

If we have a huge string, named str1, say 5 million characters long, and then str2 = str1.substr(5555, 100) so that str2 is 100 characters long and is a substring of str1 starting at 5555 (or any other randomly selected position). How JavaScript…
exebook
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Get last character of a string from a variable

I am having issues with a problem accomplished very easily in most languages but I can't seem to figure it out in batch. I want to extract the last character of a string. In pseudo code.. if var1.substring(var1.length, -1) = "0" do something In…
mgrenier
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string.substring vs string.take

If you want to only take a part of a string, the substring method is mostly used. This has a drawback that you must first test on the length of the string to avoid errors. For example you want to save data into a database, and want to cut off a…
Williams
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Find substring in a list of strings

I have a list like so and I want to be able to search within this list for a substring coming from another string. Example: List list = new List(); string srch = "There"; list.Add("1234 - Hello"); list.Add("4234 -…
user1380621
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Check if variable starts with 'http'

I'm sure this is a simple solution, just haven't found exactly what I needed. Using php, i have a variable $source. I wanna check if $source starts with 'http'. if ($source starts with 'http') { $source = "
Andelas
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Getting a substring of an attribute in XPATH

Given How do I all but the last 4 characters of @baz? One of my attempts was: /foo/bar/@baz[substring( ., 0, -4 )]
Kit Sunde
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Pandas: replace substring in string

I want to replace substring icashier.alipay.com in column in df url icashier.alipay.com/catalog/2758186/detail.aspx icashier.alipay.com/catalog/2758186/detail.aspx icashier.alipay.com/catalog/2758186/detail.aspx vk.com to aliexpress.com. Desire…
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mask all digits except first 6 and last 4 digits of a string( length varies )

I have a card number as a string, for example: string ClsCommon.str_CardNumbe r = "3456123434561234"; The length of this card number can vary from 16 to 19 digits, depending on the requirement. My requirement is that I have to show the first six…
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JavaScript text between double quotes

I would like to get the text between double quotes using JavaScript. I found online something like title.match(/".*?"/); but the thing is that sometimes I have text between double quotes but sometimes there are no quotes. What I am saying is that…
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In Java, can you use negative one with substring?

Can negative one be used as the end index for string.substring in Java? Example: String str = "test"; str.substring(0, str.indexOf("q")); Edit: Nowhere in the javadocs does it say directly that endindex cannot be negative. There are implementations…
Slight
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PHP: Is it possible to correctly SUBSTR a UTF-8 string?

I have (in an SQLite database) the following string: Лампа в вытяжке на кухне меняется, начиная с вытаскивания белого штырька справа. The string is correctly shown by PHP using print. I would like to obtain just the first 50 chars of this string,…
texnic
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Replacing a substring of a string with Python

I'd like to get a few opinions on the best way to replace a substring of a string with some other text. Here's an example: I have a string, a, which could be something like "Hello my name is $name". I also have another string, b, which I want to…
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Getting index of a character in NSString with offset & using substring in Objective-C

I have a string! NSString *myString=[NSString stringWithFormat:@"This is my lovely string"]; What I want to do is: Assuming the first character in the string is at index 0. Go to the 11th character (That is 'l' in the above case), and find the…
Umair Khan Jadoon
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SQL Server: How to group by substring

I have the following stored procedure to fetch data from a table. The table has a column "region" that contains value like "APAC: China" etc. for which I am using the substring function in order to remove the : and everything after it. The below…
user2571510
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Find all substrings that are palindromes

If the input is 'abba' then the possible palindromes are a, b, b, a, bb, abba. I understand that determining if string is palindrome is easy. It would be like: public static boolean isPalindrome(String str) { int len = str.length(); for(int i=0;…
Himanshu Yadav
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