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Add rules for tokAt(0) and strAt(0), suggested by reif
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‎rules/token-matching.xml‎

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without special pattern requirements.</summary>
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</message>
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</rule>
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<rule version="1">
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<pattern>\b[\w_]+ \. tokAt \( 0 \)</pattern>
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<message>
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<id>TokentokAt0</id>
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<severity>error</severity>
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<summary>tok->tokAt(0) is a slow way to say tok.</summary>
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</message>
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</rule>
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<rule version="1">
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<pattern>\b[\w_]+ \. strAt \( 0 \)</pattern>
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<message>
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<id>TokenstrAt0</id>
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<severity>error</severity>
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<summary>tok->strAt(0) is a slow way to say tok->str()</summary>
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</message>
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</rule>

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