19 lines
1.2 KiB
Plaintext
19 lines
1.2 KiB
Plaintext
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If the first parameter of ``++String.replace++`` is a regular expression, a special syntax can be used in the replacement string to reference capturing groups. Use ``++$n++`` to reference the group by number and ``++$<Name>++`` to reference the group by name. Because replacements strings in ``++String.replace++`` are interpreted at runtime, nothing prevents you to reference nonexisting group, with nonexisting index or bad name, then the resulting string will be wrong.
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This rule statically validates that all referenced groups exist when replacing with ``++String.replace++`` or ``++String.replaceAll++`` methods.
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== Noncompliant Code Example
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----
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const str = 'James Bond';
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console.log(str.replace(/(\w+)\s(\w+)/, '$1, $0 $1')); // Noncompliant, index is 1-based, '$0' does not exist, prints 'James, $0 James'
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console.log(str.replace(/(?<firstName>\w+)\s(?<lastName>\w+)/, '$<surname>, $<firstName> $<surname>')); // Noncompliant '$<surname>' does not exist, prints ', James '
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----
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== Compliant Solution
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----
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const str = 'James Bond';
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console.log(str.replace(/(\w+)\s(\w+)/, '$2, $1 $2'));
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console.log(str.replace(/(?<firstName>\w+)\s(?<lastName>\w+)/, '$<lastName>, $<firstName> $<lastName>'));
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----
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