$re = '/(?:Solution:)?\s*(?:\d+\. )?(.+?)(?=\n(?:Solution:|\d+\. )|\Z)/ms';
$str = 'Solution: To create a Nextflow configuration file, follow these steps:
1. Create a new file named `nextflow.config` in the project directory.
2. Declare the configuration options by using the `params` keyword followed by variable names and their default values. For example:
```
params {
inputDir = \'./input\'
outputDir = \'./output\'
numThreads = 4
}
```
3. You can also override the default values in the configuration file by specifying new values when running the pipeline. For example:
```
nextflow run my_pipeline.nf --inputDir /path/to/input --outputDir /path/to/output --numThreads 8
```
4. Save the file and use it in your pipeline by calling the parameter name with the `$` symbol. For example:
```
process myProcess {
input:
file fastq from "$inputDir/*_R{1,2}.fastq.gz"
output:
file("${outputDir}/${sampleName}_mapped.bam")
script:
"""
my_command --input $fastq --threads $numThreads --output ${outputDir}/${sampleName}_mapped.bam
"""
}
```
Next request.';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php