Regular expression visualizer using railroad diagrams
Regular Expression Test String Custom Time Format (See also ruby document; strptime) Example (Apache) Regular expression: ^(?<host>[^ ]*) [^ ]* (?<user>[^ ]*) \[(?<time>[^\]]*)\] "(?<method>\S+)(?: +(?<path>[^ ]*) +\S*)?" (?<code>[^ ]*) (?<size>[^ ]*)(?: "(?<referer>[^\"]*)" "(?<agent>[^\"]*)")?$ Time Format: %d/%b/%Y:%H:%M:%S %z
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