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grep to subscript chemical compunds

Community Beginner ,
Apr 30, 2024 Apr 30, 2024

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Good afternoon,

 

I am looking for a simple grep script to find chemical compounds without subscripts and change them to subscripts.

 

They could be with and without parenthesis (C2H4).

 

Many thanks in advance.

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How to , Scripting

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Community Expert ,
Apr 30, 2024 Apr 30, 2024

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Community Expert ,
Apr 30, 2024 Apr 30, 2024

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Community Expert ,
Apr 30, 2024 Apr 30, 2024

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Use a GREP Style and this expression:

 

 

(?<=\u\l)\d+|(?<=\u)\d+

 

 

Screenshot 2024-04-30 at 4.30.04 PM.png 

 

For the nerds: I couldn’t get the OR to work within one PLB.

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Community Expert ,
Apr 30, 2024 Apr 30, 2024

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@Scott Falkner

 

How about:

 

(?<=\u\l?)\d+

 

But I'm on my phone so can't check - "?" means "zero or one" so should work?  

 

You are right - looks like "?" can't be used inside Positive LookBehind either.

 

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Engaged ,
Apr 30, 2024 Apr 30, 2024

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Community Expert ,
Apr 30, 2024 Apr 30, 2024

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Just to add to other suggestions (I tried them and didn't quite work forme for some reason)

 

(?<=(\l|\u))\d+

 

EugeneTyson_0-1714546409915.png

 

 

But Caveat is that it will find other things that you might not want found.

 

Like C1 and C2 in the example 

 

 

 

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Community Expert ,
May 01, 2024 May 01, 2024

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A tip for typographic consideration that you define the subscript as an OpenType subscript (in the Character Style) if the font has it available. This will look much nicer.

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Community Expert ,
May 01, 2024 May 01, 2024

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Most comprehensive one I've seen was written over at CreativePro.com, and this uses GREP styles to do this automatically, but best GREP style is in the comments section by Laurent Tournier: https://creativepro.com/auto-format-superscript-and-subscript-numbers-using-grep-styles/

 

If the answer wasn't in my post, perhaps it might be on my blog at colecandoo!

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Guide ,
May 01, 2024 May 01, 2024

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@ronnag74426794 

 

Our colleague Laurent Tournier worked on this GREP fifteen years ago 😉

I guess this compact form should sum it up:

 

 

((?<=Uu[bhopqst])|(?<=A[cglmrstu]|B[aehikr]|C[adeflmnorsu]|D[bsy]|E[rsu]|F[emr]|G[ade]|H[efgos]|I[nr]|Kr|L[airu]|M[dgnot]|N[abdeiop]|Os|P[abdmortu]|R[abefghnu]|S[bcegimnr]|T[abcehilm]|Xe|Yb|Z[nr])|(?<=[BCFHIKNOPSUVWY]))[1-9]\d{0,1}

 

 

(Edit: if you need more than two digits change the ending \d{0,1} into \d{0,2} or more — I don't know whether it's chemically relevant though.)

 

Best,

Marc

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