如果使用javascript中的regex，如果字符串不是较大字符串的一部分，则替换字符串

Question

I'm trying to write a function which would Uppercase some words in a textarea but I'm having trouble, as these words could be part of other words and I only want to uppercase them when they are standing alone.

Eg: I want to uppercase OR but only when not in a word like befORe . These words can however be written in a multitude of ways, like at the start of a line, between one or more whitespace characters or in something like this: (somethingsomething)OR(somethingelse) and probably even more, depending on the way other people write their query code.

I had the idea of working with regex , but I'm not skilled enough to work out every possibility of writing these words.

I have no way of changing the textarea to other, better plugins or editors as it's already part of a functioning script.

Any helpful idea would be greatly appreciated.

EDIT: One additional question

I got really helpful answers to my question, Thank you everyone. I do have an additional question though. What if, other then checking that it's not part of a word, I also want to check that it's not preceded or followed by a . period. I tried adding (?!\\.) at the beginning of it, but that doesN't work at all. Is there a way to check for that as well?

//EDIT: Never mind, I figured it out. it's \\b(?!\\.)something(?!\\.)\\b for the check at the start and end of the word.

Answer 1

Matching on a word boundary \\b may suit:

'foo or bar'.replace(/\bor\b/, 'OR'); // foo OR bar

You can also provide a function to replace, so:

'foo or bar'.replace(/\b(or)\b/, function(m){return m.toUpperCase()})); // foo OR bar

which might be good for cases where you have multiple possible matches:

'foo or bar and fum'.replace(/\b(or|and)\b/ig, function(m){return m.toUpperCase()}); // foo OR bar AND fum

Answer 2

Something like this? ( °_• )

var txt="or some text or before (.)or(.) anywhere Or";

console.log(txt.replace(/\bor\b/gi,"OR"));     

// "OR some text OR before (.)OR(.) anywhere OR"

Answer 3

像这样：

'(something)or(somethingelse) before or oR Or OR oreos thor'.replace([^\w]([oO][rR])[^\w], 'OR');