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<source lang="mIRC">$regsubex(name,abcdefcdab,/(cd)/g,$regsubex(\t,/(.)/g,$upper(\t)))</source>
 
<source lang="mIRC">$regsubex(name,abcdefcdab,/(cd)/g,$regsubex(\t,/(.)/g,$upper(\t)))</source>
  
In the above example, the outer '''$regsubex''' will make the regex match, then it will loop on the result and replace ''\t'' accordingly everywhere in the subtext. Notice the subtext of the outer '''$regsubex''' is:
+
In the above example, the outer '''$regsubex''' will make the regex match, then it will replace ''\t'' everywhere in the subtext. The subtext of the outer '''$regsubex''' is:
 
<source lang="mIRC">$regsubex(\t,/(.)/g,$upper(\t))</source>
 
<source lang="mIRC">$regsubex(\t,/(.)/g,$upper(\t))</source>
 
All occurences of '''\t''' (can appear anywhere and it can be touching others characters) are changed with their corresponding $N value, even the one inside '''$upper'''; this means that the code won't work as expected. Typically we want this '''\t''' inside $upper() to be the corresponding value from the inner $regsubex, not the outer one.
 
All occurences of '''\t''' (can appear anywhere and it can be touching others characters) are changed with their corresponding $N value, even the one inside '''$upper'''; this means that the code won't work as expected. Typically we want this '''\t''' inside $upper() to be the corresponding value from the inner $regsubex, not the outer one.

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