GREP: how to find "th" "rd" "nd" after a number?

[Inélsòre]

I need to filter all the "th" "rd" "nd" after a number in a story to apply the Superscript character style to them. 

I tried "\n" (any number) followed by "th" (all without quotes), but it didn't work.

Tried separating them with commas "\n,th" or with braces, brackets [\n]th {\n}th but no luck.

What am I missing here? 

Could you also suggest a handbook for GREP?

Thank you

[Manan Joshi]

Try the following

(?<=\d)(?:th|rd|nd)

-Manan

[Inélsòre]

This finds no match ... 

[Willi Adelberger]

Did you spcify a Character Style?

How? Show us the character settings.

Show us the GREP PANEL inside the paragraph style.

[jmlevy]

This should work

(?<=\d)(st|nd|rd|th)

(it also includes “st” for 1st)

[Inélsòre]

This is better but it also finds me the instance "1910 they" because there is a number before th.

Could we refine this so that there is no space between the number and the letters?

[Willi Adelberger]

Add \> to the GREP

[Willi Adelberger · Accepted solution]

(?<=\d)(st|nd|rd|th)\>

[Inélsòre]

EDIT: sorry, it works.

I was adding spaces between brackets and afterward. Ignore following paragraph. 

=====

This is also finding no match.

Attached is the screenshot of what I am doing, which should reply also to your comment above.

I am doing "Find Next" not yet "Change"

[Willi Adelberger]

1. You added a space between ) and \. Remove it.
2. Why do you use Find & Replace? Make the GREP part of the Paragraph Style.

[Inélsòre]

2. Because I am a beginner 🙂 

[Inélsòre]

Could you please explain how this is working?

I understand the (st|nd|rd|th) part where | is the bitwise OR operator.

\d is "any digit", but what about the rest? 

[Willi Adelberger]

Positive Lookbehind

Formula
End of Word

[jmlevy]

@Inélsòre 

but it also finds me the instance "1910 they" because there is a number before th

If my query finds “1910 they”, it is because there is no space between “1910” and “they”. Otherwise, it only finds “th”, “st”, “rd” and “nd” when there is a digit before but not if there is a space before.

[Inélsòre]

Willi's answer added "end of word". 

Do not know what your formula was missing.

Screenshot with hidden characters

[Willi Adelberger]

This help shall not help for a concrete situation. It shoul show you how to do it, Look into the bread crumbs behind the @-menu in the dialog.
For that purpose not find & replace is the best solution, use GREP as part of the Paragraph Style.

What do you want to say with your screenshot?

[Inélsòre]

@jmlevy said that if his formula was not working it was because there was no space between 1910 and they.

I showed there was an ordinary space in the screenshot.

[Willi Adelberger]

It should work, when a \> is put at the end, that means when it is at a word’s end.