Regex to match and replace prefix and suffix in words

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Hi friends,

I need a help in making a regular expression.
I will give a example what i am trying to do.

Suppose consider a sentence,

"This is Simplg an and"

I want a regular expression to replace an with en in word and.
Regex should find an from only and, the complete word an should remain as is.
and i also want to match and replace lg with ly in word simplg

So after replacing my output sentence will be
"This is Simply an end"

Please help me in making regex for these.
Thanks in advance.

What I have tried:

Did not find any such regex on google

Posted 23-Feb-17 9:01am

sameer549

Updated 23-Feb-17 9:21am

v2

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2 solutions

Solution 2

Not a solution, but links may be useful.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

Posted 23-Feb-17 9:21am

Patrice T

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Richard Deeming · Accepted Answer · 2017-02-23T09:13:00

Solution 1

\ban(?=d\b)

will match "an" in "and", but not in "an", "hand", etc.

(?<=\bsimp)lg\b

will match "lg" in "simplg", but not in "lg", "bulge", etc.

Regular Expression Language - Quick Reference[^]
Expresso Regular Expression Tool[^]

Posted 23-Feb-17 9:13am

Richard Deeming

Comments

sameer549 23-Feb-17 15:20pm

hi richard,
thanks for comments, in the second regex u have hardcoded "simp", which will work for simplg but not for other words. Can you make it more helpful, because i am working on find replace kind of thing and user can enter any input.

Richard Deeming 23-Feb-17 15:24pm

Well, your question did say that you only wanted to match "lg" in "simplg"! :)

If you want to match "lg" at the end of any word, then use:

\Blg\b

sameer549 23-Feb-17 15:31pm

similarly, can you please make the first regex to work for any word ?

Richard Deeming 23-Feb-17 15:32pm

\ban\B

sameer549 24-Feb-17 9:09am

Hey Richard its working fine, Thank you.