Pattern Matching: Identifying partial or complete text

Question

Pattern Matching: Identifying partial or complete text

Currently, I'm facing challenges with a small script that is designed to compare the value from a text input with items in an array either partially or completely.

I am struggling specifically with the regular expression and its syntax. I was hoping to get some guidance on this matter.

for (var i=0; i < liveFilterData.length; i+=1) {

    if (liveFilterData[i].match(liveFilter.val())) {
        alert();
    }
}

The goal is for liveFilter.val() and the Regular Expression to align with the current array item liveFilterData[i]. This means that if someone enters 'H' or 'h' in the text box, it will check if there is a matching item in the array. If they type 'He' or 'he', it should match 'Head', 'Header', or 'Heading'.

Apologies, despite searching extensively online for resources on constructing regular expressions, I haven't been able to figure it out.

javascript regex match

Answer 1

Answer №1

The solution is as easy as comparing strings with a simple function:

for (let index, i = keywordData.length; i--;) { 
    if (keywordData[i].slice(0, (index = keyword.val().toLowerCase()).length) === index) {
        notifyUser();
    }
}

Make sure the keywords in keywordData are all in lowercase.

Answer 2

The solution is as easy as comparing strings with a simple function:

for (let index, i = keywordData.length; i--;) { 
    if (keywordData[i].slice(0, (index = keyword.val().toLowerCase()).length) === index) {
        notifyUser();
    }
}

Make sure the keywords in keywordData are all in lowercase.

Answer 3

Answer №2

It's a bit unclear what you're asking. Is liveFilter.val() meant to be treated as a regular expression or simply a string to compare against an array of values? My assumption is that you have an event listener for keypress, keydown, or keypress on a textbox, and the code snippet provided executes within the callback function for this event. If this is the case, there are several ways to convert the value into a valid regex: try using "^"+liveFilter.val(). Since you're using the regex in a loop, it's recommended to precompile it with new RegExp. Your loop's structure could resemble the following:

// The 'i' in the second parameter denotes a flag for case-insensitivity
// A caret '^' in regex signifies the beginning of the input
regex = new RegExp("^"+liveFilter.val(), i);
for (var i=0; i < liveFilterData.length; i+=1) {
    // The precompiled regex is utilized with regex.test to check for matches
    if (regex.test(liveFilterData[i])) {
        alert("matched " + i);
    }
}

I hope this explanation helps clarify things!

Answer 4

It's a bit unclear what you're asking. Is liveFilter.val() meant to be treated as a regular expression or simply a string to compare against an array of values? My assumption is that you have an event listener for keypress, keydown, or keypress on a textbox, and the code snippet provided executes within the callback function for this event. If this is the case, there are several ways to convert the value into a valid regex: try using "^"+liveFilter.val(). Since you're using the regex in a loop, it's recommended to precompile it with new RegExp. Your loop's structure could resemble the following:

// The 'i' in the second parameter denotes a flag for case-insensitivity
// A caret '^' in regex signifies the beginning of the input
regex = new RegExp("^"+liveFilter.val(), i);
for (var i=0; i < liveFilterData.length; i+=1) {
    // The precompiled regex is utilized with regex.test to check for matches
    if (regex.test(liveFilterData[i])) {
        alert("matched " + i);
    }
}

I hope this explanation helps clarify things!

Pattern Matching: Identifying partial or complete text

Answer №1

Answer №2

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