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Editorial Team
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Asked: 2026-05-26T04:08:10+00:00

In string n+n(n+n) , where n stands for any number or digit, I’d like

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In string n+n(n+n), where n stands for any number or digit, I’d like to match ( and replace it by *(, but only if it is followed by a number or digit.

Examples:

  • I’d like to change 2+22(2+2) into 2+22*(2+2),
  • I’d like to change -1(3) into -1*(3),
  • 4+(5/6) should stay as it is.

This is what I have: 

var str = '2+2(2+2)'.replace(/^[0-9]\(/g, '*(');

But it doesn’t work. Thanks in advance.

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1 Answer

  1. Editorial Team

    Remove the ^, and group the digits:

    '2+2(2+2)'.replace(/([0-9])\(/g, '$1*(')
'2+2(2+2)'.replace(/(\d)\(/g, '$1*(')    //Another option: [0-9] = \d

    Suggestion: 2. is often a valid number (= 2). The following RegExp removes a dot between a number and a parenthesis.

    '2+2(2+2)'.replace(/(\d\).?\(/g, '$1*(') //2.(2+2) = 2*(2+2)

    Parentheses create a group, which can be referenced using $n, where n is the index of the group: $1.

    You started your RegExp with a ^..., which means: Match a part of the string which starts with .... This behaviour was certainly not intended.

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