How do you check if a string contains a substring PHP?

Asked By: Dmitrij Peters | Last Updated: 3rd February, 2020
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You can use the PHP strpos() function to check whether a string contains a specific word or not. The strpos() function returns the position of the first occurrence of a substring in a string. If the substring is not found it returns false . Also note that string positions start at 0, and not 1.

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Simply so, how do I check if a string contains a substring?

You can use contains(), indexOf() and lastIndexOf() method to check if one String contains another String in Java or not. If a String contains another String then it's known as a substring. The indexOf() method accept a String and return starting position of the string if it exists, otherwise it will return -1.

Secondly, how do I check if a string contains a specific word in JavaScript? Check if String Contains a Specific Word in JavaScript

  1. var str = "This is the string where we will check if our word exists.";
  2. var str_pos = str. indexOf("word");
  3. if (str_pos > -1) {
  4. document. getElementById("myId"). innerHTML = "The specific word exists";
  5. } else {
  6. document. getElementById("myId").
  7. }

Subsequently, one may also ask, how do you check if a character is in a string?

  1. String.contains() which checks if the string contains a specified sequence of char values.
  2. String.indexOf() which returns the index within the string of the first occurence of the specified character or substring (there are 4 variations of this method)

What is substring in PHP?

The PHP substr() function can be used to get the substring i.e. the part of a string from a string. This function takes the start and length parameters to return the portion of string.

34 Related Question Answers Found

What is substring of a string?

A substring is a contiguous sequence of characters within a string. For instance, "the best of" is a substring of "It was the best of times". This is not to be confused with subsequence, which is a generalization of substring.

How do you check if a string contains a character C?

char *strchr(const char *s, int c); The strchr function locates the first occurrence of c (converted to a char ) in the string pointed to by s . The strchr function returns a pointer to the located character, or a null pointer if the character does not occur in the string.

How do you check if a python string contains a character?

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 I remove a character from a string?

How to remove a particular character from a string ?
  1. public class RemoveChar {
  2. public static void main(String[] args) {
  3. String str = "India is my country";
  4. System.out.println(charRemoveAt(str, 7));
  5. }
  6. public static String charRemoveAt(String str, int p) {
  7. return str.substring(0, p) + str.substring(p + 1);
  8. }

How do you check for a string in Python?


There are three methods in Python to check if a string contains another string.
  1. Use find. The find method checks if the string contains a substring.
  2. Use the in operator. The in operator returns true if the substring exists in a string and false if ?otherwise.
  3. Use count.

How do you check if a string contains a substring in jquery?

How to find if a word or a substring is present in the given string. In this case, we will use the includes() method which determines whether a string contains the specified word or a substring. If the word or substring is present in the given string, the includes() method returns true; otherwise, it returns false.

Can a string contain symbols?

If we have a variable which contains a character value, it might contain the letter `A', or the digit `2', or the symbol `&'. A string is a set of zero or more characters. For example, the string ``and'' consists of the characters `a', `n', and `d'.

How do I iterate over a string?

Iterate over Characters of String in Java
  1. Naive. Naive solution would be to use a simple for loop to process each character of the String.
  2. Using String.toCharArray()
  3. Using Iterator.
  4. Using StringTokenizer.
  5. Using String.
  6. Using Guava –
  7. Using String.chars() –
  8. Using Code Points –

How do I use charAt?

The Java String charAt(int index) method returns the character at the specified index in a string. The index value that we pass in this method should be between 0 and (length of string-1). For example: s. charAt(0) would return the first character of the string represented by instance s.

What is CharSequence in Java?


java.lang
A CharSequence is a readable sequence of characters. This interface provides uniform, read-only access to many different kinds of character sequences. This interface does not refine the general contracts of the equals and hashCode methods.

What is the Ascii character set?

Originally based on the English alphabet, ASCII encodes 128 specified characters into seven-bit integers as shown by the ASCII chart above. Ninety-five of the encoded characters are printable: these include the digits 0 to 9, lowercase letters a to z, uppercase letters A to Z, and punctuation symbols.

How does a while loop start?

The while statement creates a loop that is executed while a specified condition is true. The loop will continue to run as long as the condition is true. It will only stop when the condition becomes false. do/while - loops through a block of code once, and then repeats the loop while a specified condition is true.

How do you check if a string is in an array JavaScript?

The first old school way to identify if a string or array contains a string is using the indexOf method. If the string or array contains the target string the method returns the first character index (string) or item index (Array) of the match. If there is no match found indexOf returns -1.

How do you check if a value is in an array in JavaScript?

In JavaScript, we can check if a variable is an array by using 3 methods, using the isArray method, using the instanceof operator and using checking the constructor type if it matches an Array object. The Array. isArray() method checks whether the passed variable is an Array object.

How do you use indexOf?


The indexOf() method searches the array for the specified item, and returns its position. The search will start at the specified position, or at the beginning if no start position is specified, and end the search at the end of the array. Returns -1 if the item is not found.

How use contains in jquery?

The :contains() selector selects elements containing the specified string. The string can be contained directly in the element as text, or in a child element. This is mostly used together with another selector to select the elements containing the text in a group (like in the example above).

Is a number JavaScript?

In JavaScript, there are two ways to check if a variable is a number : isNaN() – Stands for “is Not a Number”, if variable is not a number, it return true, else return false. typeof – If variable is a number, it will returns a string named “number”.