regex101: PCRE (Legacy) Match Workspace

1st Alternative(?x) # Free spacing mode, to allow comment and better view # Matching the first line `i5-2520M` (capture group 1) ([^ ]+\s*)(?=CPU\s*@) # Matching the first line `2.50GHz` (capture group 2)

(?x)applies the following effective flags to the remainder of the pattern: gmx

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Comment: Free spacing mode, to allow comment and better view

Comment: Matching the first line `i5-2520M` (capture group 1)

Group 1([^ ]+\s*)

Negated Character Class[^ ]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\s*any whitespace character, repeated any number of times

Positive Lookahead(?=CPU\s*@)

CPUthe literal text CPU (case sensitive)

\s*any whitespace character, repeated any number of times

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Comment: Matching the first line `2.50GHz` (capture group 2)

2nd Alternative(?<=CPU\s@)(\s*\d+.\d+GHz) # Matching the `first word` on the second line. (capture group 3) # The `\s*$` is used to not match empty lines.

Positive Lookbehind(?<=CPU\s@)

CPUthe literal text CPU (case sensitive)

\sany whitespace character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 2(\s*\d+.\d+GHz)

\s*any whitespace character, repeated any number of times

\d+a digit, repeated at least once

.any character (except for line terminators)

\d+a digit, repeated at least once

GHzthe literal text GHz (case sensitive)

Comment: Matching the `first word` on the second line. (capture group 3)

Comment: The `\s*$` is used to not match empty lines.

3rd Alternative(^[^ ]+)(?!(?:.*CPU\s*@)|\s*$) # Matching the second line `CPU T2400` (capture group 4)

Group 3(^[^ ]+)

^start of line

Negated Character Class[^ ]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

Negative Lookahead(?!(?:.*CPU\s*@)|\s*$)

1st Alternative(?:.*CPU\s*@)

Non-Capturing Group(?:.*CPU\s*@)

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

CPUthe literal text CPU (case sensitive)

\s*any whitespace character, repeated any number of times

@the literal @ (64₁₀ / 100₈ / 40₁₆)

2nd Alternative\s*$

\s*any whitespace character, repeated any number of times

$end of line

Comment: Matching the second line `CPU T2400` (capture group 4)

4th Alternative(?<=CPU)(\s*[^ ]+\s*)(?=@) # Matching the second line `1.83GHz` (capture group 5)

Positive Lookbehind(?<=CPU)

CPUthe literal text CPU (case sensitive)

Group 4(\s*[^ ]+\s*)

\s*any whitespace character, repeated any number of times

Negated Character Class[^ ]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\s*any whitespace character, repeated any number of times

Positive Lookahead(?=@)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Comment: Matching the second line `1.83GHz` (capture group 5)

5th Alternative\s*(?<=@)(\s*\d+.\d+GHz)

\s*any whitespace character, repeated any number of times

Positive Lookbehind(?<=@)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 5(\s*\d+.\d+GHz)

\s*any whitespace character, repeated any number of times

\d+a digit, repeated at least once

.any character (except for line terminators)

\d+a digit, repeated at least once

GHzthe literal text GHz (case sensitive)

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

25 tokens

Regular Expression

(?x) # Free spacing mode, to allow comment and better view

# Matching the first line `i5-2520M`                (capture group 1)
([^ ]+\s*)(?=CPU\s*@)

# Matching the first line `2.50GHz`                 (capture group 2)
|(?<=CPU\s@)(\s*\d+.\d+GHz)

# Matching the `first word` on the second line.     (capture group 3)
# The `\s*$` is used to not match empty lines.
|(^[^ ]+)(?!(?:.*CPU\s*@)|\s*$) 

# Matching the second line `CPU T2400`              (capture group 4)
|(?<=CPU)(\s*[^ ]+\s*)(?=@)

# Matching the second line `1.83GHz`                (capture group 5)
|\s*(?<=@)(\s*\d+.\d+GHz)

New

Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
Genuine Intel(R) CPU T2400 @ 1.83GHz

Substitution

Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
Genuine Intel(R) CPU T2400 @ 1.83GHz