Javascript Regexes

For about a month now, I’m playing with regexes with my new project !

To replace strings that have dashes as separator with uppercase (kebab case to camel case)

let myString = "my-super-string"; // Expected Output: mySuperString

myString.replace(/-([a-zA-Z])/g, (match, group1) => group1.toUpperCase());

Prints:

'mySuperString'

Regexes for Images (HTML and Markdown)

export const imageDataRe: RegExp =
  /<img src="data:image\/(.*?);base64,(.*?)"(.*?)>/;
export const imageBlobRe: RegExp = /<img src="blob:(.*?)">/g;
export const imageBlobHttpsHttpRe: RegExp =
  /<img src="[blob:\|https:\|http:](.*?)">/g;
export const imageBlobHttpRe: RegExp = /<img src="blob:http:\/\/.*?\/(.*?)">/;
export const imageMarkdownRe: RegExp = /^\!\[(.*?)\]\((.*?)\)/;
export const imageLocalRe: RegExp =
  /<img src="(?!http)(.*?)" alt="(.*?)" width="(.*?)">/;
export const imageSrcRe: RegExp = /<img src="(.*?)"(.*?)>/g;
export const imageDataOnlyRe: RegExp = /data:image\/(.*?);base64,(.*?)$/;

Escaping Regex Function

export function sanitizeRegex(input: string) {
  // Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions#escaping
  return input.replace(/[\/.*+?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
}

Function to verify if a string contains an image

export function checkImage(html: string): boolean {
  // On macos it uses the blob: approach
  // on windows it uses the data: approach
  if (
    html.match(/<img src="blob:.*"/g) ||
    html.match(/<img src="data:.*"/g) ||
    html.match(/<img src="https?:.*"/g)
  ) {
    return true;
  }

  return false;
}