仅在句子的开头和结尾处替换空格

Question

Does anyone know how to replace white spaces in the beginning and end of the string with &nbsp using regular expression and javascript;

Example:

`   Hello World. The white spaces in between the sentence should not be replaced. Only the start and end should be replaced with &nbsp.   `

After replacing:

`   Hello World. The white spaces in between the sentence should not be replaced. Only the start and end should be replaced with &nbsp.   `

Answer 1

You need to first capture the space and than in callback function of replace you can add the no. of   based on length of match.

• ^\\s+ - Matches spaces at the start of string.
• | - Alternation same as logical OR.
• \\s+$ - Matches spaces at the end of string

 let str = ` Hello World. The white spaces in between the sentence should not be replaced. Only the start and end should be replaced with &nbsp. ` let op = str.replace(/^\\s+|\\s+$/g, function(match){ return ` `.repeat(match.length) }) console.log(op)