Regular Expressions 101

Positive Lookahead(?=(\boh\b(?:(?!\boh\b).)*?\bwell\b|\bwell\b(?:(?!\bwell\b).)*?\boh\b))

Group 1(\boh\b(?:(?!\boh\b).)*?\bwell\b|\bwell\b(?:(?!\bwell\b).)*?\boh\b)

1st Alternative\boh\b(?:(?!\boh\b).)*?\bwell\b

\ban ASCII word boundary

ohthe literal text oh (case sensitive)

\ban ASCII word boundary

Non-Capturing Group(?:(?!\boh\b).)*?

*?repeats the group contents below any number of times:

Negative Lookahead(?!\boh\b)

\ban ASCII word boundary

ohthe literal text oh (case sensitive)

\ban ASCII word boundary

.any character (except for line terminators)

\ban ASCII word boundary

wellthe literal text well (case sensitive)

\ban ASCII word boundary

2nd Alternative\bwell\b(?:(?!\bwell\b).)*?\boh\b

\ban ASCII word boundary

wellthe literal text well (case sensitive)

\ban ASCII word boundary

Non-Capturing Group(?:(?!\bwell\b).)*?

*?repeats the group contents below any number of times:

Negative Lookahead(?!\bwell\b)

\ban ASCII word boundary

wellthe literal text well (case sensitive)

\ban ASCII word boundary

.any character (except for line terminators)

\ban ASCII word boundary

ohthe literal text oh (case sensitive)

\ban ASCII word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?=(\boh\b(?:(?!\boh\b).)*?\bwell\b|\bwell\b(?:(?!\bwell\b).)*?\boh\b))

New

oh i mean well i do n't know well he 's like oh
yeah so well he did n't say oh he said f** well you know what he 's like
oh you know well why well maybe he thought oh well good
oh my god well what the hell did he oh you know

Regular Expression

Extraction