正则表达式javascript及匹配结果

Question

I am getting 2 different formats which matches my regular expression.

matches = ['10 am', '5 pm', 'by appointment only']

or

['By Appointment :', '10 am', '8 pm' ]

So in first case, the result should be

'10 am to 5 pm by appointment only'

For second case, the result should be

'By Appointment: 10 am to 5 pm'

I tried with below code after joining with 'to'

let value = matches.join(' to ');

After joining, this would give text as:

'10 am to 5 pm to by appointment only'

or

'By Appointment: to 10 am to 8 pm'

if (value.includes('to by appointment only')) {
    value = value.replace('to by appointment only', 'by appointment only');
}
if (value.includes('By Appointment: to')) {
    value = value.replace('By Appointment: to', 'By Appointment:');
}

Basically here I am trying to remove unwanted 'to' text after joining how can I refactor it in better way with the help of regular expression to achieve the same result?

Answer 1

You can easily achieve it by iterating the matches array and append the to string if the item ends with am . You can check that with the help of String.endsWith()

Live Demo :

 const matches = ['10 am', '5 pm', 'by appointment only']; matches.forEach((item, index) => { if (item.endsWith('am')) { matches[index] = item + ' to ' } }); console.log(matches.join(''));