find.md

find

Find the position of a substring in a string.

API

Numeric.string.find(text, needle, reverse = false)

Reports the index of the first or last occurrence.

• Parameters:
  • text: String or array of strings to search
  • needle: Substring whose position is reported
  • reverse: When true searches from the end
• Returns: Match positions matching the input shape
• NumPy: Covers np.strings.find, np.strings.rfind, np.strings.index, np.strings.rindex, np.char.find, np.char.rfind, np.char.index, np.char.rindex through a single Numerix method.

Examples

Find the first occurrence

import Numeric from '@neabyte/numerix'

const index = Numeric.string.find('hello', 'l')

console.log(index)
// 2

Find the last occurrence

import Numeric from '@neabyte/numerix'

const index = Numeric.string.find('hello', 'l', true)

console.log(index)
// 3

Find a missing substring

import Numeric from '@neabyte/numerix'

const index = Numeric.string.find('hello', 'z')

console.log(index)
// -1

Find within an array of strings

import Numeric from '@neabyte/numerix'

const indices = Numeric.string.find(['hello', 'world'], 'o')

console.log(indices)
// [4,1]