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I have a string like below

**102-Gracecroft-Dr_Havre-de-Grace_MD_21078_M60846-99581**

I want to remove the last part which starts with M and digits which will be dynamic values. So the result string should be like 

"**102-Gracecroft-Dr_Havre-de-Grace_MD**"

How can i achieve it using regex. i tried with [/.*(?=[/d+]_M[\d-]+)/]

But it is not working. Any ideas?

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  • The removed "last part" actually starts with _M and the "dynamic values" contains a - in addition to digits. Commented Nov 15, 2016 at 11:38

1 Answer 1

Reset to default
4 
▶ str = "102-Gracecroft-Dr_Havre-de-Grace_MD_21078_M60846-99581"
#⇒ "102-Gracecroft-Dr_Havre-de-Grace_MD_21078_M60846-99581"
▶ str[/.*(?=_M[\d-]+)/]
#⇒ "102-Gracecroft-Dr_Havre-de-Grace_MD_21078"

If the asterisks are indeed parts of the real input:

▶ str = "**102-Gracecroft-Dr_Havre-de-Grace_MD_21078_M60846-99581**"
▶ str.gsub /_M[\d-]+(?=\*{2}\z)/, ''
#⇒ "**102-Gracecroft-Dr_Havre-de-Grace_MD_21078**"
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7 Comments

I want to exclude 21078 also. Sorry. I typed the resultant string wrongly. It should be "102-Gracecroft-Dr_Havre-de-Grace_MD"
This is easily achievable basing on snippet I have provided. Left as a homework.
I tried with the below one. .*(?=[/d+]_M[\d-]+) But it dint work either. Any suggestions
You have a typo (forward slash instead of back slash, and there is underscore to take into account, and + should not be disclosed within square brackets...) It should be .*(?=_\d+_M[\d-]+).
@ mudasobwa. But this returned me 102-Gracecroft-Dr_Havre-de-Grace_MD_2107. excluding only '8'. I want to exclude 21078 also.
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