Regular expression ignore strings start with a specific string

Question

I need to find all the words containing some string. For example "team" and replace it with another string. The string will as a substring for example:

team of experts
team manager
A big team

I need to replace all those places with the string "hlhl$$@team".

I use the regular expression:

String exp= String.Format("({0}\\s)|({0}$)", "team);

The problem is that strings that are already are "hlhl$$@team" match the regular expression and are being replaced to "hlhl$$@hlhl$$@team" How can I ignore those strings that start with hlhl$$@? Thanks.

Is it C#? Try Regex.Replace(s, @"(?<!hlhl\$\$@)\bteam\b", "hlhl$$$$@team") — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jan 2, 2017 at 18:58

Wiktor Stribiżew · Accepted Answer · 2017-01-02 19:03:04Z

2

Negative Lookbehind is your friend.

You want team which is not preceded with hlhl$$@. So the regex is

(?<!hlhl\$\$@)team

Here $ is required to escape because it is an special character in regex.

edited Jan 2, 2017 at 19:03

Wiktor Stribiżew

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answered Jan 2, 2017 at 18:57

sazzad

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