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RegEx
REGEX102
3
Match Exact Text Safely
Literal matches find the exact characters you type.
What is a literal match?
A literal match means the RegEx is looking for the actual characters in the pattern, not a special meaning.
Before RegEx gets powerful, it is simple.
If you search for cat, the pattern looks for c then a then t.
Literal matching is useful for words, file names, labels, log messages, and short fragments.
Some characters are special in RegEx, so exact matching sometimes needs escaping.
Safe RegEx work starts with exact text, then adds symbols only when needed.
Exact word search
const text = "Order status: paid";
console.log(/paid/.test(text)); // true
console.log(/refund/.test(text)); // false
/paid/ looks for the exact letters paid.
The match can appear inside a larger string.
/refund/ does not match because that word is not present.
Literal matching is usually the first test.
After the literal match works, you can decide whether symbols are needed.
Simple
Exact text is easy to read.
Safe
It reduces surprise matches.
Debuggable
You can see what the pattern means.
Foundation
Advanced RegEx builds on literal matching.
Too loose
Exact first
Ask ChatGPT: "Is this RegEx matching exact text, or am I using symbols that make it too broad?"
Search for the exact word paid.
Search for the exact word error.
Try a word that is not in the text.
Explain the difference between match and no match.
Identify one character that may need escaping later.
Starting with clever patterns instead of exact text.
Forgetting that case can matter.
Searching for part of a word by accident.
Not checking negative examples.
Forgetting that punctuation may be special.
Use literal RegEx patterns to find exact text safely.
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