Regular Expressions 101

User-Agent: the literal text User-Agent: (case sensitive)

Group UserAgent(?<UserAgent>[^\\r\\n]*)

Negated Character Class[^\\r\\n]*

*matches any number of characters outside the set below:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

nthe literal n (110₁₀ / 156₈ / 6E₁₆) (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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

User-Agent: (?<UserAgent>[^\\r\\n]*)

New

POST /xxx/yyyy HTTP/1.1\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0\r\nAccept: application/json\r\nAccept-Language: en-US,en;q=0.5\r\nX-XSRF-TOKEN: 989g8ddfgdf7979df\r\ntimestamp: 2021-04-07T18:35:50.639Z\r\nContent-Type: application/json;charset=utf-8\r\nContent-Length: 340\r\nOrigin: https://example.com\r\nConnection: keep-alive\r\nReferer: https://my.example.com\r\n