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How to only find a substring in a string?

By : Surender Bhati
Date : October 16 2020, 06:10 AM
may help you . I have a large strings on my php page. , You can use regex.
This pattern will find what you need.
code :
preg_match_all("/Document\s+Number\s*:\s*(.*?\s*-.*?\s*-\s*.*?)\s|Date\s*:\s*(\d{4}\s*-\s*\d{2}\s*-\s*\d{2})/i", $str, $matches);

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How to find substring in a string and return a new string with a number of characters surrounding the substring - Javasc

By : Franklin Palomino
Date : March 29 2020, 07:55 AM
With these it helps First of all I am new to javascript. , You can use this function:
code :
function pullSubstring(searched,text,bordersLenght) {
    var idx = text.indexOf(searched);
    if (idx == -1 )
        return "";

    var startFrom = idx-bordersLenght;
    var endAt = idx + bordersLenght + searched.length;

    if (startFrom < 0)

    if (endAt > text.length-1)
        endAt = text.length-1;

    return text.substring(startFrom,endAt);


Python: Find a substring in a string and returning the index of the substring

By : Qwerty
Date : March 29 2020, 07:55 AM
help you fix your problem Ideally you would use str.find or str.index like demented hedgehog said. But you said you can't ...
Your problem is your code searches only for the first character of your search string which(the first one) is at index 2.
code :
def find_str(s, char):
    index = 0

    if char in s:
        c = char[0]
        for ch in s:
            if ch == c:
                if s[index:index+len(char)] == char:
                    return index

            index += 1

    return -1

print(find_str("Happy birthday", "py"))
print(find_str("Happy birthday", "rth"))
print(find_str("Happy birthday", "rh"))

Regex: Find substring starts with AND end with from a string and replace a word from substring

By : user3656118
Date : March 29 2020, 07:55 AM
hop of those help? Possible inputs:
code :
var re = /^(\S+)\s*\S*(?=,)/gmi; 
var str = 'Hi John, I have recently..\nhi , I have...\nHi Hans, I have...\nHi, I have...';
var subst = '$1 David'; 

var result = str.replace(re, subst);

What does the string.find(substring) function returns when substring is just a newline?

By : JamesWithCode
Date : March 29 2020, 07:55 AM
around this issue Pressing enter on an empty input does not put a newline into the string. std::getline consumes the newline so all you have in an empty string for the sub-string.
According to cppreference the function std::string::find
code :
if(position != std::string::npos && !substr.empty())

How do I find the count of a substring in a string when substring and string both are lists?

By : Genady D
Date : March 29 2020, 07:55 AM
Does that help Not sure if I get exactly what you need (shouldn't def = 2 in your example?), but I think this might be close to what you need:
code :
from collections import defaultdict
from itertools import product

counts = defaultdict(int)
for x, y in product(X, Y):
    if y in x:
        counts[y] += 1
for k, v in counts.items():
    print('{} = {}'.format(k, v))
def = 2
abc = 2
xyz = 2
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