regex101: PCRE (Legacy) Match Workspace

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

(?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`

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`

2nd Alternative(?<=CPU)(\s*@\s*\d+.\d+GHz) # Matching the second line `CPU T2400`

Positive Lookbehind(?<=CPU)

CPUthe literal text CPU (case sensitive)

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

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

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\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 second line `CPU T2400`

3rd Alternative(CPU\s*[^ ]+\s*)(?=@) # Matching the second line `1.83GHz`

Group 3(CPU\s*[^ ]+\s*)

CPUthe literal text CPU (case sensitive)

\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`

4th Alternative\s*(?<=@)(\s*\d+.\d+GHz)

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

Positive Lookbehind(?<=@)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 4(\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`
([^ ]+\s*)(?=CPU\s*@)

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

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

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

Unit Tests

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