How to determine the string type (Numeric, AlphaNumeric, etc.) in Salesforce

Introduction

Salesforce provides new string methods to determine what type of characters contains in a particular string by using some of the below methods.

Methods to Determine Character Types

Alpha

1. String str = 'AlphaOnly';
2. System.assertEquals(true, str.isAlpha());

The above string method will return true, if the string contain only characters.

isAlphaSpace

1. String str = 'AlphaOnly Space';
2. System.assertEquals(true, str.isAlphaSpace());

The above string method will return true, if the string contain alphabet and white spaces.

isAlphaNumeric

1. String str = 'AlphaNumeric123';
2. System.assertEquals(true, str.isAlphaNumeric());

The above string method will return true, if the string contain alphabet, numbers.

isAlphanumericSpace

1. String str = 'Alpha Numeric123';
2. System.assertEquals(true, str.isAlphanumericSpace());

The above string method will return true, if the string contain alphabet, numbers and white spaces.

isNumeric

1. String str = '432';
2. System.assertEquals(true, str.isNumeric());

The above string method will return true, if the string contain numbers only.

isNumericSpace

1. String str = '432 ';
2. System.assertEquals(true, str.isNumericSpace());

The above string method will return true, if the string contain numbers with spaces.

isWhitespace

1. String str = ' ';
2. System.assertEquals(true, str.isWhitespace());

The above string method will return true, if the string contain only white spaces.