问题
Related (but not the same):
Javascript Regex: How to bold specific words with regex?
Given a needle and a haystack... I want to put bold tags around the needle. So what regex expression would I use with replace()? I want SPACE to be the delimeter and I want the search to be case insensitive and I want special characters (such as @!#.()) to be ignored in the search
so say the needle is "cow" and the haystack is
cows, at www.cows.com, milk some COWS!
would turn into
<b>cows</b>, at www.cows.com, milk some <b>COWS</b>!
also keywords should be able to have spaces in it so if the keyword is "who is mgmt"...
great band. who. is. mgmt btw?
would turn into
great band. <b>who. is. mgmt</b> btw?
I've got this currently:
function updateHaystack(input, needle) {
return input.replace(new RegExp('(^|\\s)(' + needle + ')(\\s|$)','ig'), '$1<b>$2</b>$3');
}
unfortunately it doesn't bold words that are concatenated with a special char... eg. !cow does not turn into !<b>cow</b>
Thank you
回答1:
It sounds like \b
should do what you want. It's a zero-width match of "word boundaries".
function updateHaystack(input, needle) {
return input.replace(new RegExp('\\b(' + needle + ')\\b','ig'), '<b>$1</b>');
}
回答2:
If you want to allow punctuation to be part of the needle, just add it:
function updateHaystack(input, needle) {
return input.replace(new RegExp('(^|\\s)(' + needle + '[!.,?]?)(\\s|$)','ig'), '$1<b>$2</b>$3');
}
回答3:
Allow any non-whitespace character to be part of the needle:
"cows, at www.cows.com, milk COWS!".replace(/(\s|^)(cow\S*)(\s|$)/ig, '$1<b>$2</b>$3');
// Will return: "<b>cows,</b> at www.cows.com, milk <b>COWS!</b>"
回答4:
So you need to put an optional section for the special char in the regex:
'(^|\\s)(' + needle + '[@!#.(),?]*)(\\s|$)'
来源:https://stackoverflow.com/questions/1247636/javascript-regex-bolding-needles-in-a-haystack