How do I search for a specific string in python?

How do I search for a specific string in python?

Python – How to search for a string in text files?

  1. Open a file.
  2. Set variables index and flag to zero.
  3. Run a loop through the file line by line.
  4. In that loop check condition using the ‘in’ operator for string present in line or not.
  5. After loop again check condition for the flag is set or not.
  6. Close a file.

How do you check if a string is in a text file python?

“how to check if a string is in a text file python” Code Answer’s

  1. file = open(“search.txt”)
  2. print(file. read())
  3. search_word = input(“enter a word you want to search in file: “)
  4. if(search_word in file. read()):
  5. print(“word found”)
  6. else:
  7. print(“word not found”)

How do you check if a line contains a string in python?

You can use the in operator or the string’s find method to check if a string contains another string. The in operator returns True if the substring exists in the string. Otherwise, it returns False. The find method returns the index of the beginning of the substring if found, otherwise -1 is returned.

How do you search for a word in python?

String find() in Python The find(query) method is built-in to standard python. Just call the method on the string object to search for a string, like so: obj. find(“search”). The find() method searches for a query string and returns the character position if found.

What does find () mean in python?

The find() method finds the first occurrence of the specified value. The find() method returns -1 if the value is not found.

How do you find if a string is present in a text file?

First you need to create a method that receives an array of type string, then we convert that array to a string, then we read all the text from the txt and we can use (Contains) to know if the text we send exists in our txt and we validate if that is truth or false, I hope it helps you.

How do you check if a string contains only certain characters in Python?

Use all() to check if a string contains certain characters

  1. string = “abcd”
  2. matched_list = [characters in char_list for characters in string]
  3. print(matched_list) [True, True, True, False]
  4. string_contains_chars = all(matched_list)
  5. print(string_contains_chars) False.

How do I search for a word in a string?

To find a word in the string, we are using indexOf() and contains() methods of String class. The indexOf() method is used to find an index of the specified substring in the present string. It returns a positive integer as an index if substring found else returns -1.

How do I find a word in a string?

How to search a word inside a string?

  1. public class SearchStringEmp {
  2. public static void main(String[] args) {
  3. String strOrig = “Hello readers”;
  4. int intIndex = strOrig. indexOf(“Hello”);
  5. if(intIndex == – 1) {
  6. System. out. println(“Hello not found”);
  7. } else {
  8. System. out. println(“Found Hello at index “+ intIndex);

How do I use grep to find a string?

To find a pattern that is more than one word long, enclose the string with single or double quotation marks. The grep command can search for a string in groups of files. When it finds a pattern that matches in more than one file, it prints the name of the file, followed by a colon, then the line matching the pattern.