RegEx match exactly 4 digits

Question

Ok, i have a regex pattern like this /^([SW])\\w+([0-9]{4})$/

This pattern should match a string like SW0001 with SW-Prefix an

Answer 1

in regex,

• ^ means you want to match the start of the string
• $ means you want to match the end of the string

so if you want to match "SW" + exactly 4 digits you need

^SW[0-9]{4}$