strIndexOf

strIndexOf(
  const string,    // string to search in
  const patt,      // pattern searched
  [const start])   // start position in string

Searches an occurrence of patt in string. If the pattern is found, the 1-based index of the first character is returned. If the pattern is not found, 0 is returned.

The optional start denotes the 1-based starting position in string.

Examples:

strIndexOf('hello world', 'o');     // 5
strIndexOf('hello world', 'o', 6);  // 8
strIndexOf('hello world', 'x');     // 0