What Are Regular Expressions?
Finding patterns in text
A regular expression describes a pattern of characters - like 'digits only' or 'an email shape' - so you can find it.
What you'll learn from this poster
- What you can doDescribe a text pattern / Find or replace / Also for input checks
- Basic symbols\d = a digit / \w = a letter or digit / . = any one character / * + ? = repetition
- Examples\d+ = a run of digits / ^...$ = start and end of line / [abc] = any one of them
- Watch outSyntax varies a little by language / Don't over-complicate / Test to be sure
Regex is a tool to describe text patterns
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