I do admit that a regexp looks cleaner in terms of code. If it's a real bottleneck then use a for loop, otherwise stick with the regular expression for reasons of "elegance". Lots of answers available, speed is irrelevant for such small functions unless you are calling them a few hundred thousand times in a short period of time.
For me, a regular expression is best, but keep it in a closure so you don't build it every time:. Returns true if s is a single vowel upper or lower case and false for everything else.
Which means, if char. You could also use ['a','e','i','o','u'] and skip the length test, but then you are creating an array each time you call the function. There are ways of mimicking this via closures, but those are a bit obscure to read. Basically it checks for the index of the character in the string of vowels.
Active today. Viewed 85k times. Max Max 2 2 gold badges 13 13 silver badges 20 20 bronze badges. Just out of curiosity - what is your function supposed to return if the string length isn't 1? I'm not sure what the context is, but you will have problems dealing with different languages. It's still a vowel even if it existed on it's own. Can you give more information? Active Oldest Votes.One of the most common tasks in any programming language is to find out whether a string contains a given substring.
The first parameter is the substring to search for, and the second optional parameter is the index to start the search from default index is 0. The includes method was introduced in ES6 and works in all modern browsers except Internet Explorer. Unlike the good old indexOf method, which returns the starting index of the substring, the includes method returns true if the string contains the specified substring. Otherwise, it returns false.
The search method searches the position of the substring in a string and returns the position of the match. The search value can be a string or a regular expression. It returns -1 if no match is found. Another way to check if a string contains a substring is to use the match method.
It accepts a regular expression as a parameter and searches the string for a match. If it finds the matches, it returns an object, and null if no match is found. If the regular expression does not include the g modifier, the match method will return only the first match in the string.
The regular expression test method checks if a match exists in a string.
So what is the best way? If you have any questions or feedback, please feel free to send me a tweet anytime. Follow attacomsian on Twitter. Subscribe to RSS Feed. Need help to launch a new product? I am available for contract work. Hire me to accomplish your business goals with engineering and design. Try now. Join the weekly newsletter to improve your coding skills quickly, with easy to follow tutorials and protips every week.
Using regular expression test method, we can verify if a string contains a substring or not.
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And lodash and underscore js libraries are well documented and well tested. So we can use them without any worries. Similary underscore js contains includes method and we can pass substring and actual string as parameters, if match found it will return true otherwise false. Wait before leaving. I am One among a million Software engineers of India. I write beautiful markup.
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. Usually I would expect a String. There is a String. Note that this does not work in Internet Explorer or some other old browsers with no or incomplete ES6 support.
To make it work in old browsers, you may wish to use a transpiler like Babela shim library like es6-shimor this polyfill from MDN :.
So indexOf it is Is it possible to do a case insensitive search? This doesn't seem to work for me in Google App Script. To make it work in old browsers, you may wish to use a transpiler like Babela shim library like es6-shimor this polyfill from MDN : if! Mark Fisher 5 5 silver badges 20 20 bronze badges.
Just do "potato". Otherwise -1 is returned.Get the latest tutorials on SysAdmin and open source topics. Write for DigitalOcean You get paid, we donate to tech non-profits. DigitalOcean Meetups Find and meet other developers in your city. Become an author. While this tutorial has content that we believe is of great benefit to our community, we have not yet tested or edited it to ensure you have an error-free learning experience. It's on our list, and we're working on it!
The function then returns the total number of matches vowels found. You can stop the execution of a function and return a value from that function with return statements. First an iterative approach and then the use of regular expressions. Before running through the text we would have a counter initialized and assigned a value of zero.
This is relevant to us because regular expressions will help us find the desired characters within the text passed. By extension, regular expressions can help us to do more remarkable things such as the implementation of content filters. Regular expressions also stay the same across programming languages.
There are following two ways in which this can be done. Method 1 : Iteration over the string Follow the below steps to write a program to check the vowels in a string using iteration. Note that we use indexOf method of java. This method will return -1 if the character does not exist in the string, otherwise its index or position in the string.
You can also use contains method of java.
This method accepts a string argument which will be checked to be present and returns true if the string is present, false otherwise. To use contains, you need to convert character to a string using Character.
Method 2 : Using Regular expression A regular expression can be used to determine the vowels in a string. It will check if any of the characters between square brackets exists in the string.
Pattern; import java. Pattern class accepts a string argument and compiles it into a pattern. Matcher object using its matches method. Matcher object then searches for the presence of regular expression in the given string using its find method. Multiple invocations of find method keep returning true till the end of the string is reached or any invocation returns false. Output of the above program is. Never Miss an article! Get the new post delivered straight into your inbox, enter your email and hit the button.
Vowels in the string are: o i a 3. Pattern ; import java. Vowels in the string are: o i a. Spread the word!!! How to find power of a number raised to another number in java December 13, Java program to reverse a string using stack October 23, How to check if a number belongs to Fibonacci series in java in Java July 8, Mark Your Impression Cancel reply.
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Accept Terms.Given a string str of lowercase English alphabets, the task is to check whether the string is a vowel prime or not. A string is said to be vowel prime if all the vowels in the string appear at only prime indices. Approach: Use Sieve of Eratosthenes to find all the prime numbers less than N so that every index of the string can be checked for primality.
Now, if there is some non-prime index such that the character at that position is a vowel then the string is not vowel prime else it is. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.
See your article appearing on the GeeksforGeeks main page and help other Geeks. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment? Please use ide. Program to implement FLAMES game Split the given string into Primes : Digit DP Find lexicographically smallest string in at most one swaps Remove odd frequency characters from the string Longest palindrome formed by concatenating and reordering strings of equal length Longest Palindrome in a String formed by concatenating its prefix and suffix Minimum letters to be removed to make all occurrences of a given letter continuous Queries for Nth smallest character for a given range in a string Check whether the given string is Palindrome using Stack Count maximum occurrence of subsequence in string such that indices in subsequence is in A.
A value in prime[i] will. Python3 implementation of the approach. Function that returns true if c is a vowel. Function that returns true if. Create a boolean array "prime[ A value in prime[i] will finally be false.
If prime[p] is not changed. Update all multiples of p greater than or. For every character of the given String. If current character is vowel. This code is contributed by Mohit Kumar. WriteLine "Yes". WriteLine "No". Recommended Posts: Python program to check if given string is vowel Palindrome Check whether the frequencies of all the characters in a string are prime or not Check whether count of distinct characters in a string is Prime or not Alternate vowel and consonant string Lexicographically first alternate vowel and consonant string Print all Subsequences of String which Start with Vowel and End with Consonant.
Check out this Author's contributed articles. Improved By : mohit kumar 29princi singh. Load Comments.
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