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21 interview questions on RegExfor developers (2025)

Test your technical skills before an interview of RegEx with 21 corrected questions. Beginner, Intermediate or Expert level.

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Hard
5 votes160 runs2 comments

Find all the strings that match the regular expression: `/abracadabra{2,4}/gmi`

Back-end developer
RegEx
pattern
Nick LAM YEE MANat Mar 28, 2023
Easy
4 votes183 runs0 comment

Which of the following is not a regular expression?

Back-end developer
RegEx
characters
Nick LAM YEE MANat Mar 28, 2023
Expert
3 votes134 runs0 comment

Count the number of matches of the RegEx `a*` in the sentence: `I went to my grandparent house`

Back-end developer
RegEx
string
Nick LAM YEE MANat Mar 28, 2023
Medium
2 votes167 runs0 comment

Write a RegEx that has the same behavior as trim (JS) or strip(Python)

Back-end developer
RegEx
functions
Nick LAM YEE MANat Mar 28, 2023
Easy
2 votes156 runs0 comment

Write a regular expression that matches a character that repeats exactly 6 times.

Back-end developer
RegEx
character
Nick LAM YEE MANat May 16, 2023
Medium
2 votes152 runs0 comment

Write a regular expression that matches anything that looks like an HTML tag.

Back-end developer
RegEx
html
Nick LAM YEE MANat Mar 28, 2023
Easy
2 votes137 runs0 comment

Find the intruder in the following regex: `^[a-zA-Z0-9_-]+$`

Back-end developer
RegEx
pattern
Nick LAM YEE MANat Mar 28, 2023
Expert
2 votes133 runs1 comment

Write a regular expression to extract a file name from a path, except if the file is a .html file

Back-end developer
RegEx
file
Nick LAM YEE MANat Mar 28, 2023
Expert
1 vote176 runs
1 comment

Write a regular expression to match 'i{,4}' in a string

Back-end developer
RegEx
pattern
Nick LAM YEE MANat Mar 28, 2023
Hard
1 vote154 runs0 comment

Write a regular expression that matches any number in a string

Back-end developer
RegEx
pattern
Nick LAM YEE MANat Mar 28, 2023
Medium
1 vote150 runs0 comment

Write a regular expression to match the characters . and ?

Back-end developer
RegEx
characters
Nick LAM YEE MANat Mar 28, 2023
Medium
1 vote142 runs0 comment

Write a regular expression that replaces all tags without content with self-closing tags

Back-end developer
RegEx
tags
Nick LAM YEE MANat Mar 28, 2023
Medium
1 vote139 runs0 comment

Write a RegEx that will only find the word 'test' in the sentence 'I write a testimonial about this test'

Back-end developer
RegEx
pattern
Nick LAM YEE MANat Mar 28, 2023
Easy
1 vote137 runs0 comment

Find all the occurrences of the substring 'abracadabra' in the string 'abracadabraabracadabraabracadabra'

Back-end developer
RegEx
quantifiers
Nick LAM YEE MANat Mar 28, 2023
Medium
1 vote133 runs0 comment

What does this RegEx do : `/(^\w+)(?=\.\w+)/old_$1/gm`

Back-end developer
RegEx
file
Nick LAM YEE MANat Mar 28, 2023
Medium
1 vote132 runs0 comment

Write a regular expression that matches a valid email address

Back-end developer
RegEx
email
Nick LAM YEE MANat Mar 28, 2023
Easy
1 vote130 runs0 comment

What does the RegEx `/[abc]/` match

Back-end developer
RegEx
regular expressions
character classes
Nick LAM YEE MANat Mar 28, 2023
Medium
1 vote108 runs0 comment

Which RegEx(s) can be used to verify that a password meets these criteria: - at least 1 (one) lowercase letter - at least 1 (one) uppercase letter - at least 1 (one) number - at least 8 (eight) characters

Back-end developer
RegEx
password
Nick LAM YEE MANat Mar 28, 2023
Hard
0 vote133 runs1 comment

Which letters will be match by the RegEx `/\x42/gmi`

Back-end developer
RegEx
characters
Nick LAM YEE MANat Feb 6, 2024
Medium
0 vote67 runs0 comment

Write a regular expression that matches anything that is not `a`, `b` or `c`

Back-end developer
RegEx
character classes
Nick LAM YEE MANat Mar 28, 2023