Patterns that occur in the negative look behind JavaScript in regular expressions

Question

Patterns that occur in the negative look behind JavaScript in regular expressions

Despite its seemingly trivial nature, I am struggling to identify the mistake in my approach. I am attempting to recognize sentence endings by using a regular expression to locate periods. However, I only want to detect periods that follow a word with more than two letters to avoid false positives like "St. Nicholas."

The current expression I am using is:

/\w{3,}\./g

Unfortunately, this pattern seems to be capturing the entire word instead of just the period. What could be the issue here?

UPDATE:
I am looking for

"St. Kitts is really cool. Like seriously, sweet."

To match the periods after both "cool" and "sweet," but not after "St."

UPDATE 2:
Since I am working in Javascript, a standard lookbehind like (?<=text) will not work.

javascript regex lookbehind

Answer 1

Answer №1

To utilize groups effectively, follow these steps:

let pattern = \d{2,}(\.);
let result = pattern.exec(input);
alert(result[1]);  // Make sure to capture the period

In case there are multiple periods present:

result = pattern.exec(myInput);
while (result != null) {
    // matched period: result[1]        
    result = pattern.exec(myInput);
}

Answer 2

To utilize groups effectively, follow these steps:

let pattern = \d{2,}(\.);
let result = pattern.exec(input);
alert(result[1]);  // Make sure to capture the period

In case there are multiple periods present:

result = pattern.exec(myInput);
while (result != null) {
    // matched period: result[1]        
    result = pattern.exec(myInput);
}

Patterns that occur in the negative look behind JavaScript in regular expressions

Answer №1

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