grep to subscript chemical compunds

@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

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/

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.

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

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

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

Like C1 and C2 in the example 

@ronnag74426794 
https://community.adobe.com/t5/indesign-discussions/underline-molecular-formulae-of-chemistry-like-h2so4-h2o-which-subscript/m-p/14522605#M568218

Use a GREP Style and this expression:

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

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

Perhaps this thread will be useful:

https://community.adobe.com/t5/indesign-discussions/subscript-basic-chemical-formulas/m-p/7974202