hate-regex

regex-replace-alt-1.js

const placeHolderPattern = /#{(\w+)}/g;
const args = process.argv.slice(2);

if (args.length < 2) {
  console.log('missing arguments');
  process.exit(1);
}

const replacements = [
  { name: 'placeholder1', value: args[0] },
  { name: 'placeholder2', value: args[1] },
];

function replacer(match, placeHolderName) { 
  const replacement = replacements.find(r => r.name === placeHolderName);
  if (!replacement) {
    throw new Error(`Replacement for ${placeHolder} place holder does not exist.`);
  }
  return replacement.value || '';
} 

let output = 'some text template #{placeholder1} and #{placeholder2} and some more text #{placeholder1}';
output = output.replace(placeHolderPattern, replacer);
console.log(output);

regex-replace-alt-2.js

const args = process.argv.slice(2);

if (args.length < 2) {
  console.log('missing arguments');
  process.exit(1);
}

const replacements = [
  { name: 'placeholder1', value: args[0] },
  { name: 'placeholder2', value: args[1] },
];

let output = 'some text template #{placeholder1} and #{placeholder2} and some more text #{placeholder1}';
replacements.forEach((item) => {
  output = output.replaceAll(`#{${item.name}}`, item.value || '');
}
);

console.log(output);

regex-replace-alt-3.js

const args = process.argv.slice(2);

if (args.length < 2) {
  console.log('missing arguments');
  process.exit(1);
}

const replacements = [
  { name: 'placeholder1', value: args[0] },
  { name: 'placeholder2', value: args[1] },
];

let output = 'some text template #{placeholder1} and #{placeholder2} and some more text #{placeholder1}';
replacements.forEach((item) => {
  const placeholder = `#{${item.name}}`;
  while (output.includes(placeholder)) {
    output = output.replace(placeholder, ()=>item.value || '');
  }
}
);

console.log(output);

regex-replace.js

const placeHolderPattern = /#{(\w+)}/;
const allPlaceHoldersPattern = new RegExp(placeHolderPattern, 'g');
const args = process.argv.slice(2);

if (args.length < 2) {
  console.log('missing arguments');
  process.exit(1);
}

const replacements = [
  {
    name: 'placeholder1',
    value: args[0]
  },
  {
    name: 'placeholder2',
    value: args[1]
  },
];

let output = 'some text template #{placeholder1} and #{placeholder2} and some more text #{placeholder1}';
let matches;

do {
  console.log('after replacement output=' + output);
  matches = allPlaceHoldersPattern.exec(output);
  if (matches) {
    const placeHolder = matches[1];
    const replacement = replacements.find(r => r.name === placeHolder);
    
    if (!replacement) {
      throw new Error(`Replacement for ${placeHolder} place holder does not exist.`);
    }
    
    output = output.replace(placeHolderPattern, replacement.value || '');
    allPlaceHoldersPattern.lastIndex = 0;
  }
} while (matches);

console.log(output);