# Valid email filter (ERE)
grep -Ei '^[A-Za-z0-9._%+-]+@[A-Za-z0-9][A-Za-z0-9.-]*\.[A-Za-z]{2,}$' input
# Valid email filter (ERE) - Strict
nicholashoule
/ bash-checks.md
Last active
November 5, 2026 14:38
Bash commands for validating email addresses and phone numbers
nicholashoule
/ random.md
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November 5, 2026 14:33
Linux, macOS, and Windows Random commands
Linux provides cryptographic randomness through /dev/random and /dev/urandom, both backed by the kernel’s central entropy pool. Modern kernels seed and maintain this pool using diverse sources—interrupt timing, CPU jitter, hardware RNGs, and virtualization-provided entropy. On current systems (kernel 5.4+), these built‑in mechanisms are typically sufficient without additional entropy services. Starting from Linux kernel v5.4, the GitHub - jirka-h/haveged inspired algorithm has been included in the Linux kernel.
nicholashoule
/ network-information.md
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November 5, 2026 14:35
Linux, macOS, and Windows commands for network information
nicholashoule
/ gitbranches.md
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April 27, 2026 06:11
Git prune and delete merged local branches
nicholashoule
/ gitcherrypick.md
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March 12, 2026 06:39
Cherry pick a merge and create a pull request for the master branch