I haven't done a lot of work with regex, and I'm getting stuck. I'm trying to take a string and make it title case, but with some exceptions. I also want to remove any whitespace.
Currently it's removing whitespace and the title case is working, but it's not following the exceptions. Is there a way to combine the "title" variable with "regex" variable, and make it so the exceptions are working?
const toTitleCase = str => {
const title = str.replace(/\s\s+/g, ' ');
const regex = /(^|\b(?!(AC | HVAC)\b))\w+/g;
const updatedTitle = title
.toLowerCase()
.replace(regex, (s) => s[0].toUpperCase() + s.slice(1));
return updatedTitle;
}
console.log(toTitleCase(`this is an HVAC AC converter`))From the above comment ...
"It looks like the OP wants to exclude the words
'AC'and'HVAC'from the title-case replacement. A pattern which would achieve this is e.g.\b(?!HVAC|AC)(?<upper>[\w])(?<lower>[\w]+)\b"
The code which covers all of the OP's requirements then might look like the following example ...
function toTitleCase(value) {
return String(value)
.trim()
.replace(/\s+/g, ' ')
.replace(
/\b(?!HVAC|AC)(?<upper>[\w])(?<lower>[\w]+)\b/g,
(match, upper, lower) => `${ upper.toUpperCase() }${ lower.toLowerCase() }`,
);
}
console.log(
"toTitleCase(' This is an HVAC AC converter. ') ...",
`'${ toTitleCase(' This is an HVAC AC converter. ') }'`
);.as-console-wrapper { min-height: 100%!important; top: 0; }One could take the above approach a step further by providing the to be excluded words as additional parameter(s) ...
function toTitleCase(value, ...exludedWordList) {
const exceptions = exludedWordList
.flat(Infinity)
.map(item => String(item).trim())
.join('|');
return String(value)
.trim()
.replace(/\s+/g, ' ')
.replace(
RegExp(`\\b(?!${ exceptions })(?<upper>[\\w])(?<lower>[\\w]+)\\b`, 'g'),
(match, upper, lower) => `${ upper.toUpperCase() }${ lower.toLowerCase() }`,
);
}
console.log(
"toTitleCase(' this is an HVAC AC converter. ', ['AC', 'HVAC']) ...",
`'${ toTitleCase(' this is an HVAC AC converter. ', ['AC', 'HVAC']) }'`
);
console.log(
"toTitleCase(' this is an HVAC AC converter. ', 'is', 'an', 'converter') ...",
`'${ toTitleCase(' this is an HVAC AC converter. ', 'is', 'an', 'converter') }'`
);.as-console-wrapper { min-height: 100%!important; top: 0; }