Remove all Non-Alphanumeric Characters from a String (with help from regexp)

Apr 14, 2017 · 137 words · 1 minute read

#alphanum #clean #compile #parsing #regex #regexp #remove #replace #strings #symbols

It’s often useful be be able to remove characters from a string which aren’t relevant, for example when being passed strings which might have $ or £ symbols in, or when parsing content a user has typed in. To do this we use the regexp package where we compile a regex to clear out anything with isn’t a letter of the alphabet or a number.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21


package main

import (
    "fmt"
    "log"
    "regexp"
)

func main() {

    example := "#GoLangCode!$!"

    // Make a Regex to say we only want letters and numbers
    reg, err := regexp.Compile("[^a-zA-Z0-9]+")
    if err != nil {
        log.Fatal(err)
    }
    processedString := reg.ReplaceAllString(example, "")

    fmt.Printf("A string of %s becomes %s \n", example, processedString)
}

remove alpha numeric chars

Validating an Email Address – Jun 29, 2020
Validating email addresses, like many thing, are one of those things you can put any amount of effort you want into. The solutions range from nice’n’quick, by using regex to check the email address is formatted correctly - through to complicated, by actually trying to interface with the remote server. There are also some middle grounds available in between, like checking the top level domain has a valid MX record and detecting temporary email addresses (if these aren’t wanted).
Encode and Decode Strings using Base 64 – Jun 30, 2018
The example below shows to how to encode and then subsequently decode a string using base 64. Doing this has many uses, one of which to safely encode byte data in structures like JSON. We use the encoding/base64 package to do this, which takes in and returns a byte array into it’s EncodeToString and DecodeString methods. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 package main import ( "encoding/base64" "fmt" ) func main() { myString := "This is golangcode.
Search and Replace in a String – Oct 20, 2017
As programmers we often need to take a string and replace parts of it with something else. The code below has three examples, first of which is a basic ‘find all’ and replace, the second changes only the first occurrence of ‘sound’ and finally the third example demonstrates how to change a string containing quotes to use escaped quotes. These are changed by using the 4th argument to define how many times to replace, with -1 being every time.

Follow @EddTurtle Follow @golangcode

Author: Edd Turtle

Edd is the Lead Developer at Hoowla, a prop-tech startup, where he spends much of his time working on production-ready Go and PHP code. He loves coding, but also enjoys cycling and camping in his spare time.

See something which isn't right? You can contribute to this page on GitHub or just let us know in the comments below - Thanks for reading!

Related Posts

Author: Edd Turtle