Regular Expressions 101

Non-Capturing Group(?:This is a|\G(?!\A))

1st AlternativeThis is a

This is athe literal text This is a (case sensitive)

2nd Alternative\G(?!\A)

\Gstart of current search

Negative Lookahead(?!\A)

\Astart of string

\h+any horizontal whitespace character, repeated at least once

Group 1((?=.*so it is\.)string\d+)

Positive Lookahead(?=.*so it is\.)

.*any character (except for line terminators), repeated any number of times

so it isthe literal text so it is (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

stringthe literal text string (case sensitive)

\d+a digit, repeated at least once

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

(?:This is a|\G(?!\A))\h+((?=.*so it is\.)string\d+)

New

This is a string1 string2 string3 string4 string5 string6 string7 so it is.