powershell - Regex to find space before a month name or abbreviation -


in powershell script i'm trying write regex find space before month name or abbreviation (e.g. jan, january, feb, february, etc.). i'm using drive -replace operator. i've constructed regex works, finds space before works jane, marcus, etc. find space before exact words such jan, january, mar, march, etc. ideas?

[ ](?=jan|(?:uary)?|feb(?:ruary)?|mar(?:ch)?|apr(?:il)?|may|jun(?:e)?|jul(?:y)?|aug(?:ust)?|sep(?:tember)?|oct(?:ober)?|nov(?:ember)?|dec(?:ember)?)

thanks in advance help.

you've got of right. missing part end-of-the-word anchor \b, prevents matching prefixes of longer words:

\s(?=(?:jan(?:uary)?|feb(?:ruary)?|mar(?:ch)?|apr(?:il)?|may|jun(?:e)?|jul(?:y)?|aug(?:ust)?|sep(?:tember)?|oct(?:ober)?|nov(?:ember)?|dec(?:ember)?)\b)

demo.

note: replaces [ ] \s, matches tabs , newlines.


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