Regular Expressions: QA Challenge Accepted Conf (March 2015)
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The document provides an overview of regular expressions (regex) and their applications for QA engineers, including syntax and common patterns for validating text such as emails and phone numbers. It emphasizes the importance of regex in validation, automation testing scripts, and data extraction. Additionally, it offers resources for further learning and practical demos for understanding and using regular expressions.
![What are Regular Expressions?
• Regular expressions (regex)
– Match text by pattern
• Patterns are defined by special syntax, e.g.
– [0-9]+ matches non-empty sequence of digits
– [A-Z][a-z]* matches a capital + small letters
– s+ matches whitespace (non-empty)
• S+ matches non-whitespace
2](https://image.slidesharecdn.com/qa-challenge-accepted-march-2015-regular-expressions-nakov-150314045613-conversion-gate01/85/Regular-Expressions-QA-Challenge-Accepted-Conf-March-2015-2-320.jpg)
![More Patterns
• d+ matches digits
– D+ matches non-digits
• w+ matches letters (Unicode)
– W+ matches non-letters
• +d{1,3}([ -]*[0-9]){6,} matches
international phone, e.g. +359 2 123-456
4](https://image.slidesharecdn.com/qa-challenge-accepted-march-2015-regular-expressions-nakov-150314045613-conversion-gate01/85/Regular-Expressions-QA-Challenge-Accepted-Conf-March-2015-4-320.jpg)
![Validation by Regex
• ^ matches start of text
• $ matches end of text
• ^+d{1,3}([ -]*[0-9]){6,}$ validates
international phone
• +359 2 123-456 is a valid phone
• +359 (888) 123-456 is a invalid phone
6](https://image.slidesharecdn.com/qa-challenge-accepted-march-2015-regular-expressions-nakov-150314045613-conversion-gate01/85/Regular-Expressions-QA-Challenge-Accepted-Conf-March-2015-6-320.jpg)
![Regex Literals
• The classical (Perl syntax) is:
– /<regex>/<options>
• Examples:
– /[a-z]+/gi matches all non-empty sequences
of Latin letters, case-insensitively
– /[a-z0-9._%+-]+@[a-z0-9.-]+.[a-z]{2,20}/gi
matches emails (simplified pattern)
8](https://image.slidesharecdn.com/qa-challenge-accepted-march-2015-regular-expressions-nakov-150314045613-conversion-gate01/85/Regular-Expressions-QA-Challenge-Accepted-Conf-March-2015-8-320.jpg)
![Some JS Code: Validation
var emailPattern =
/^[a-z0-9._%+-]+@[a-z0-9.-]+.[a-z]{2,20}$/i;
console.log(emailPattern.test("test@abv.bg"));
console.log(emailPattern.test("a.hills@gtx.de"));
console.log(emailPattern.test("invalid@@mail"));
console.log(emailPattern.test("err test@abv.bg"));
10](https://image.slidesharecdn.com/qa-challenge-accepted-march-2015-regular-expressions-nakov-150314045613-conversion-gate01/85/Regular-Expressions-QA-Challenge-Accepted-Conf-March-2015-10-320.jpg)
![Some JS Code: Split
var towns = "Sofia, Varna,Pleven, Veliko Tarnovo;
Paris – London––Vienann Пловдив|Каспичан";
console.log(towns.split(/W+/)); // incorrect
console.log(towns.split(/s*[.,|;nt–]+s*/));
11](https://image.slidesharecdn.com/qa-challenge-accepted-march-2015-regular-expressions-nakov-150314045613-conversion-gate01/85/Regular-Expressions-QA-Challenge-Accepted-Conf-March-2015-11-320.jpg)
Regular Expressions: QA Challenge Accepted Conf (March 2015)
- 1. Regular Expressions … and Their Place in the QA Engineer's Life Svetlin Nakov Manager Training and Inspiration Software University http://softuni.bg
- 2. What are Regular Expressions? • Regular expressions (regex) – Match text by pattern • Patterns are defined by special syntax, e.g. – [0-9]+ matches non-empty sequence of digits – [A-Z][a-z]* matches a capital + small letters – s+ matches whitespace (non-empty) • S+ matches non-whitespace 2
- 4. More Patterns • d+ matches digits – D+ matches non-digits • w+ matches letters (Unicode) – W+ matches non-letters • +d{1,3}([ -]*[0-9]){6,} matches international phone, e.g. +359 2 123-456 4
- 6. Validation by Regex • ^ matches start of text • $ matches end of text • ^+d{1,3}([ -]*[0-9]){6,}$ validates international phone • +359 2 123-456 is a valid phone • +359 (888) 123-456 is a invalid phone 6
- 8. Regex Literals • The classical (Perl syntax) is: – /<regex>/<options> • Examples: – /[a-z]+/gi matches all non-empty sequences of Latin letters, case-insensitively – /[a-z0-9._%+-]+@[a-z0-9.-]+.[a-z]{2,20}/gi matches emails (simplified pattern) 8
- 10. Some JS Code: Validation var emailPattern = /^[a-z0-9._%+-]+@[a-z0-9.-]+.[a-z]{2,20}$/i; console.log(emailPattern.test("[email protected]")); console.log(emailPattern.test("[email protected]")); console.log(emailPattern.test("invalid@@mail")); console.log(emailPattern.test("err [email protected]")); 10
- 11. Some JS Code: Split var towns = "Sofia, Varna,Pleven, Veliko Tarnovo; Paris – London––Vienann Пловдив|Каспичан"; console.log(towns.split(/W+/)); // incorrect console.log(towns.split(/s*[.,|;nt–]+s*/)); 11
- 12. Some JS Code: Match var text = "I was born at 14-Jun-1980. Today is 14-Mar-2015. Next year starts at 1-Jan-2016 and ends at 31-Dec-2016."; var dateRegex = /d{1,2}-w{3}-d{4}/gm; console.log(text.match(dateRegex)); 12
- 13. Regex for QA Engineers • Why should a QA understand regex? – Validation prepare regex for developers – Write automation testing scripts • E.g. find a text on the page by regex – Parse a text, extract info, split data, … 13
- 14. Resources • Play with regex: – http://www.regexr.com – https://regex101.com • Visual regex debugger: – https://www.debuggex.com • Regex explained (in Bulgarian) – http://goo.gl/NbBIPe – 14
- 15. Resources (2) • Interactive Regex Tutorial – http://regexone.com • Regex @ W3Schools – http://w3schools.com/jsref/jsref_obj_regexp.asp • Regex Tutorial (for Java) – vogella.com/tutorials/JavaRegularExpressions/article.html 15