CODEWITHSUNDEEP
pythonregexstringparsing
newdev14
newdev14

Reputation: 1111

pattern of words exists in string

I want to find if a certain pattern of words exists in a string. As an example, in the string below, I want to know if the words "wish" and "allow" occur. Here, ordering matters so I want to only return True if "wish" appears before "allow". "I wish the platform gave the ability to allow one to change settings" Result: True a counter-example: "I allowed my setting to change, only wish this could be reversed" Result: False

Any help will be appreciated

Upvotes: 0

Views: 32

Answers (3)

glibdud
glibdud

Reputation: 7840

You don't actually need regex for this:

def checkwordorder(phrase, word1, word2):
    try:
        return phrase.lower().index(word1.lower()) < phrase.lower().index(word2.lower())
    except ValueError:
        return False

>>> checkwordorder('I wish the platform gave the ability to allow one to change settings', 'wish', 'allow')
True
>>> checkwordorder('I allowed my setting to change, only wish this could be reversed', 'wish', 'allow')
False

Upvotes: 0

Navneet Dwivedi
Navneet Dwivedi

Reputation: 163

You can try using my concept implemented in javascript.

you always get the result apple which is appeared just before pumpkin.

<html>
<body>

<p>Click the button to display the last position of the element "Apple" before pumpkin</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var fruits = ["Banana","Orange","Apple","Mango","Banana","Orange","Apple","Mango","pumpkin","Apple"];
    var a = fruits.indexOf("pumpkin");
    var b = fruits.lastIndexOf("Apple",a);
    var x = document.getElementById("demo");
    x.innerHTML = b;
}
</script>


</body>
</html>

Upvotes: 0

digijim
digijim

Reputation: 686

I went to Regex101.com and created a Regex expression that meets your needs:

/wish(.?|.*)allow/

This means "find the word 'wish' anywhere in the text, followed by zero, one, or many other characters, followed by the word 'allow'".

Regex101.com is a great sandbox for building Regex expressions. Any time I'm not sure how the Regex pattern-matching should be formatted, I use this tool.

Upvotes: 2

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