Only match the character if it is not at the beginning of the line and if another character is not on the

Is there a way to only match the character "=" in a string if it is not at the beginning of a line and no other character, for example "$", appears on the same line?

  1. The equal sign should not be at the beginning of a line
  2. No other character, such as "$", should appear on the same line

Just to clarify, in the examples below:

$a = b
a
= b
a = b

I am only interested in matching the equal sign in the last line.

Answer №1

This particular solution should work

/^[^$]+=[^$]+$/

This regular expression will find patterns that consist of 1 or more characters that are not the dollar sign ($), followed by an equal sign, and then 1 or more characters that are not the dollar sign ($).

var test = [
    '$a = b',
    'a',
    '= b',
    'a = b',
];
console.log(test.map(function (a) {
  return a+' :'+/^[^$]+=[^$]+$/.test(a);
}));

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