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Took ceilingcat's suggestion. Thanks!

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edited Feb 25, 2022 at 15:55

Java (JDK), 7171, 70 bytes

(b,B)->{B="_";for(b=47;b++<122;)if(b<58|b>64&&b<91|b>96)B+=b;returnB+=b>57&b<65|b>90&b<97?"":b;return B;}

Inspired by an answer from dorukayhan this is a java.util.function.BiFunction<Character, String, String>

(b,B)->{B="_";for(b=47;b++<122;)if(b<58|b>64&&b<91|b>96)B+=b;return B;}

Inspired by an answer from dorukayhan this is a java.util.function.BiFunction<Character, String, String>

(b,B)->{B="_";for(b=47;b++<122;)B+=b>57&b<65|b>90&b<97?"":b;return B;}

Inspired by an answer from dorukayhan this is a java.util.function.BiFunction<Character, String, String>

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created Feb 25, 2022 at 0:52

(b,B)->{B="_";for(b=47;b++<122;)if(b<58|b>64&&b<91|b>96)B+=b;return B;}

Inspired by an answer from dorukayhan this is a java.util.function.BiFunction<Character, String, String>